BusyBox - The Swiss Army Knife of Embedded Linux
BusyBox <function> [arguments...] # or
<function> [arguments...] # if symlinked
BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides minimalist replacements for most of the utilities you usually find in fileutils, shellutils, findutils, textutils, grep, gzip, tar, etc. BusyBox provides a fairly complete POSIX environment for any small or embedded system. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts.
BusyBox has been written with size-optimization and limited resources in mind. It is also extremely modular so you can easily include or exclude commands (or features) at compile time. This makes it easy to customize your embedded systems. To create a working system, just add a kernel, a shell (such as ash), and an editor (such as elvis-tiny or ae).
When you create a link to BusyBox for the function you wish to use, when BusyBox is called using that link it will behave as if the command itself has been invoked.
For example, entering
ln -s ./BusyBox ls
./ls
will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled into BusyBox).
You can also invoke BusyBox by issuing the command as an argument on the command line. For example, entering
./BusyBox ls
will also cause BusyBox to behave as 'ls'.
Most BusyBox commands support the -h option to provide a terse runtime description of their behavior.
Currently defined functions include:
addgroup, adduser, adjtimex, ar, arping, ash, awk, basename,
bunzip2, busybox, bzcat, cal, cat, chgrp, chmod, chown, chroot,
chvt, clear, cmp, cp, cpio, crond, crontab, cut, date, dc, dd,
deallocvt, delgroup, deluser, df, dirname, dmesg, dos2unix, dpkg,
dpkg-deb, du, dumpkmap, dumpleases, dutmp, echo, egrep, env, expr,
false, fbset, fdflush, fdformat, fgrep, find, fold, free, freeramdisk,
fsck.minix, ftpget, ftpput, getopt, getty, grep, gunzip, gzip,
halt, hdparm, head, hexdump, hostid, hostname, httpd, hush, hwclock,
id, ifconfig, ifdown, ifup, inetd, init, insmod, ip, ipcalc, iplink,
iproute, iptunnel, kill, killall, klogd, lash, length, linuxrc,
ln, loadacm, loadfont, loadkmap, logger, login, logname, logread,
losetup, ls, lsmod, makedevs, md5sum, mesg, minit, mkdir, mkfifo,
mkfs.minix, mknod, mkswap, mktemp, modprobe, more, mount, msh,
msvc, mt, mv, nameif, nc, netstat, nslookup, od, openvt, passwd,
patch, pidfilehack, pidof, ping, ping6, pivot_root, poweroff,
printf, ps, pwd, rdate, readlink, realpath, reboot, renice, reset,
rm, rmdir, rmmod, route, rpm, rpm2cpio, run-parts, sed, setkeycodes,
sha1sum, sleep, sort, start-stop-daemon, strings, stty, su, sulogin,
swapoff, swapon, sync, syslogd, tail, tar, tee, telnet, telnetd,
test, tftp, time, top, touch, tr, traceroute, true, tty, udhcpc,
udhcpd, umount, uname, uncompress, uniq, unix2dos, unzip,
uptime, usleep, uudecode, uuencode, vconfig, vi, vlock, watch,
watchdog, wc, wget, which, who, whoami, xargs, yes, zcat, [
Adds a group to the systemOptions:
-g specify gid
-------------------------------
Adds a user to the systemOptions:
-h DIR Assign home directory DIR
-g GECOS Assign gecos field GECOS
-s SHELL Assign login shell SHELL
-G Add the user to existing group GROUP
-S create a system user (ignored)
-D Do not assign a password (logins still possible via ssh)
-H Do not create the home directory
-------------------------------
Reads and optionally sets system timebase parameters. See adjtimex(2).
Options:
-q quiet mode - do not print
-o offset time offset, microseconds
-f frequency frequency adjust, integer kernel units (65536 is 1ppm)
(positive values make the system clock run fast)
-t tick microseconds per tick, usually 10000
-p timeconstant
-------------------------------
Extract or list FILES from an ar archive.
Options:
-o preserve original dates
-p extract to stdout
-t list
-x extract
-v verbosely list files processed
-------------------------------
Ping hosts by ARP requests/replies.
Options:
-f Quit on first ARP reply
-q Be quiet
-b Keep broadcasting, don't go unicast
-D Duplicated address detection mode
-U Unsolicited ARP mode, update your neighbours
-A ARP answer mode, update your neighbours
-c count Stop after sending count ARP request packets
-w timeout Time to wait for ARP reply, in seconds
-I device Outgoing interface name, default is eth0
-s sender Set specific sender IP address
target Target IP address of ARP request
-------------------------------
Strips directory path and suffixes from FILE. If specified, also removes any trailing SUFFIX.
Example:
$ basename /usr/local/bin/foo
foo
$ basename /usr/local/bin/
bin
$ basename /foo/bar.txt .txt
bar
-------------------------------
Uncompress FILE (or standard input if FILE is '-' or omitted).
Options:
-c Write output to standard output
-f Force
-------------------------------
Uncompress to stdout.
-------------------------------
Display a calendar.
Options:
-j Use julian dates.
-y Display the entire year.
-------------------------------
Concatenates FILE(s) and prints them to stdout.
Options:
-u ignored since unbuffered i/o is always used
Example:
$ cat /proc/uptime
110716.72 17.67
-------------------------------
Change the group membership of each FILE to GROUP.
Options:
-R Changes files and directories recursively.
Example:
$ ls -l /tmp/foo
-r--r--r-- 1 andersen andersen 0 Apr 12 18:25 /tmp/foo
$ chgrp root /tmp/foo
$ ls -l /tmp/foo
-r--r--r-- 1 andersen root 0 Apr 12 18:25 /tmp/foo
-------------------------------
Each MODE is one or more of the letters ugoa, one of the symbols +-= and one or more of the letters rwxst.
Options:
-R Changes files and directories recursively.
Example:
$ ls -l /tmp/foo
-rw-rw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo
$ chmod u+x /tmp/foo
$ ls -l /tmp/foo
-rwxrw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo*
$ chmod 444 /tmp/foo
$ ls -l /tmp/foo
-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo
-------------------------------
Change the owner and/or group of each FILE to OWNER and/or GROUP.
Options:
-R Changes files and directories recursively.
-h Do not dereference symbolic links.
Example:
$ ls -l /tmp/foo
-r--r--r-- 1 andersen andersen 0 Apr 12 18:25 /tmp/foo
$ chown root /tmp/foo
$ ls -l /tmp/foo
-r--r--r-- 1 root andersen 0 Apr 12 18:25 /tmp/foo
$ chown root.root /tmp/foo
ls -l /tmp/foo
-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo
-------------------------------
Run COMMAND with root directory set to NEWROOT.
Example:
$ ls -l /bin/ls
lrwxrwxrwx 1 root root 12 Apr 13 00:46 /bin/ls -> /BusyBox
$ mount /dev/hdc1 /mnt -t minix
$ chroot /mnt
$ ls -l /bin/ls
-rwxr-xr-x 1 root root 40816 Feb 5 07:45 /bin/ls*
-------------------------------
Changes the foreground virtual terminal to /dev/ttyN
-------------------------------
Clear screen.
-------------------------------
Compare files.
Options:
-l Write the byte numbers (decimal) and values (octal)
for all differing bytes.
-s quiet mode - do not print
-------------------------------
Copies SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
-a Same as -dpR
-d Preserves links
-p Preserves file attributes if possible
-f force (implied; ignored) - always set
-R Copies directories recursively
-------------------------------
Extract or list files from a cpio archive Main operation mode:
d make leading directories
i extract
m preserve mtime
t list
u unconditional overwrite
F input from file
-------------------------------
-d [#] -l [#] -S -L logfile -f -b -c dir
-d num debug level
-l num log level (8 - default)
-S log to syslod (defualt)
-L file log to file
-f run in fordeground
-b run in background (default)
-c dir working dir
-------------------------------
file <opts> replace crontab from file
- <opts> replace crontab from stdin
-u user specify user
-l [user] list crontab for user
-e [user] edit crontab for user
-d [user] delete crontab for user
-c dir specify crontab directory
-------------------------------
Prints selected fields from each input FILE to standard output.
Options:
-b LIST Output only bytes from LIST
-c LIST Output only characters from LIST
-d CHAR Use CHAR instead of tab as the field delimiter
-s Output only the lines containing delimiter
-f N Print only these fields
-n Ignored
Example:
$ echo "Hello world" | cut -f 1 -d ' '
Hello
$ echo "Hello world" | cut -f 2 -d ' '
world
-------------------------------
Displays the current time in the given FORMAT, or sets the system date.
Options:
-R Outputs RFC-822 compliant date string
-d STRING Displays time described by STRING, not `now'
-I[TIMESPEC] Outputs an ISO-8601 compliant date/time string.
TIMESPEC=`date' (or missing) for date only,
`hours', `minutes', or `seconds' for date and,
time to the indicated precision.
-s Sets time described by STRING
-u Prints or sets Coordinated Universal Time
Example:
$ date
Wed Apr 12 18:52:41 MDT 2000
-------------------------------
This is a Tiny RPN calculator that understands the following operations: +, -, /, *, and, or, not, eor. i.e., 'dc 2 2 add' -> 4, and 'dc 8 8 \* 2 2 + /' -> 16p - Prints the value on the top of the stack, without altering the stack. f - Prints the entire contents of the stack without altering anything. o - Pops the value off the top of the stack and uses it to set the output radix.
Only 10 and 16 are supported.
Example:
$ dc 2 2 +
4
$ dc 8 8 * 2 2 + /
16
$ dc 0 1 and
0
$ dc 0 1 or
1
$ echo 72 9 div 8 mul | dc
64
-------------------------------
| dd [if=FILE] [of=FILE] [bs=N] [count=N] [skip=N] | |
| [seek=N] [conv=notrunc|noerror|sync] |
Copy a file, converting and formatting according to options
if=FILE read from FILE instead of stdin
of=FILE write to FILE instead of stdout
bs=N read and write N bytes at a time
count=N copy only N input blocks
skip=N skip N input blocks
seek=N skip N output blocks
conv=notrunc don't truncate output file
conv=noerror continue after read errors
conv=sync pad blocks with zeros
Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024), MD (x1000000), M (x1048576), GD (x1000000000) or G (x1073741824).
Example:
$ dd if=/dev/zero of=/dev/ram1 bs=1M count=4
4+0 records in
4+0 records out
-------------------------------
Deallocate unused virtual terminal /dev/ttyN
-------------------------------
Deletes group GROUP from the system
-------------------------------
Deletes user USER from the system
-------------------------------
Print the filesystem space used and space available.
Options:
-h print sizes in human readable format (e.g., 1K 243M 2G )
-m print sizes in megabytes
-k print sizes in kilobytes(default)
Example:
$ df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda3 8690864 8553540 137324 98% /
/dev/sda1 64216 36364 27852 57% /boot
$ df /dev/sda3
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda3 8690864 8553540 137324 98% /
-------------------------------
Strips non-directory suffix from FILENAME
Example:
$ dirname /tmp/foo
/tmp
$ dirname /tmp/foo/
/tmp
-------------------------------
Prints or controls the kernel ring buffer
Options:
-c Clears the ring buffer's contents after printing
-n LEVEL Sets console logging level
-s SIZE Use a buffer of size SIZE
-------------------------------
Converts FILE from dos format to unix format. When no option is given, the input is converted to the opposite output format. When no file is given, uses stdin for input and stdout for output.
Options:
-u output will be in UNIX format
-d output will be in DOS format
-------------------------------
-i Install the package
-C Configure an unpackaged package
-P Purge all files of a package
-r Remove all but the configuration files for a package
-u Unpack a package, but dont configure it
-------------------------------
Perform actions on debian packages (.debs)
Options:
-c List contents of filesystem tree
-e Extract control files to [argument] directory
-f Display control field name starting with [argument]
-I Display the control filenamed [argument]
-t Extract filesystem tree to stdout in tar format
-x Extract packages filesystem tree to directory
-X Verbose extract
Example:
$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp
-------------------------------
Summarizes disk space used for each FILE and/or directory. Disk space is printed in units of 1024 bytes.
Options:
-a show sizes of files in addition to directories
-H follow symbolic links that are FILE command line args
-L follow all symbolic links encountered
-d N limit output to directories (and files with -a) of depth < N
-c output a grand total
-l count sizes many times if hard linked
-s display only a total for each argument
-x skip directories on different filesystems
-h print sizes in human readable format (e.g., 1K 243M 2G )
-m print sizes in megabytes
-k print sizes in kilobytes(default)
Example:
$ du
16 ./CVS
12 ./kernel-patches/CVS
80 ./kernel-patches
12 ./tests/CVS
36 ./tests
12 ./scripts/CVS
16 ./scripts
12 ./docs/CVS
104 ./docs
2417 .
-------------------------------
Prints out a binary keyboard translation table to standard output.
Example:
$ dumpkmap > keymap
-------------------------------
-f, --file=FILENAME Leases file to load
-r, --remaining Interepret lease times as time remaing
-a, --absolute Interepret lease times as expire time
-------------------------------
Prints the specified ARGs to stdout
Options:
-n suppress trailing newline
-e interpret backslash-escaped characters (i.e., \t=tab)
-E disable interpretation of backslash-escaped characters
Example:
$ echo "Erik is cool"
Erik is cool
$ echo -e "Erik\nis\ncool"
Erik
is
cool
$ echo "Erik\nis\ncool"
Erik\nis\ncool
-------------------------------
Prints the current environment or runs a program after setting up the specified environment.
Options:
-, -i start with an empty environment
-u remove variable from the environment
-------------------------------
Prints the value of EXPRESSION to standard output.
EXPRESSION may be:
ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2
ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0
ARG1 < ARG2 ARG1 is less than ARG2
ARG1 <= ARG2 ARG1 is less than or equal to ARG2
ARG1 = ARG2 ARG1 is equal to ARG2
ARG1 != ARG2 ARG1 is unequal to ARG2
ARG1 >= ARG2 ARG1 is greater than or equal to ARG2
ARG1 > ARG2 ARG1 is greater than ARG2
ARG1 + ARG2 arithmetic sum of ARG1 and ARG2
ARG1 - ARG2 arithmetic difference of ARG1 and ARG2
ARG1 * ARG2 arithmetic product of ARG1 and ARG2
ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2
ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2
STRING : REGEXP anchored pattern match of REGEXP in STRING
match STRING REGEXP same as STRING : REGEXP
substr STRING POS LENGTH substring of STRING, POS counted from 1
index STRING CHARS index in STRING where any CHARS is found,
or 0
length STRING length of STRING
quote TOKEN interpret TOKEN as a string, even if
it is a keyword like `match' or an
operator like `/'
( EXPRESSION ) value of EXPRESSION
Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicographical. Pattern matches return the string matched between \( and \) or null; if \( and \) are not used, they return the number of characters matched or 0.
-------------------------------
Return an exit code of FALSE (1).
Example:
$ false
$ echo $?
1
-------------------------------
Show and modify frame buffer settings
Example:
$ fbset
mode "1024x768-76"
# D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz
geometry 1024 768 1024 768 16
timings 12714 128 32 16 4 128 4
accel false
rgba 5/11,6/5,5/0,0/0
endmode
-------------------------------
Forces floppy disk drive to detect disk change
-------------------------------
Low-level formats a floppy disk
Options:
-n Don't verify after format
-------------------------------
Change partition table
Options:
-l List partition table(s)
-u Give Start and End in sector (instead of cylinder) units
-s PARTITION Give partition size(s) in blocks
-b 2048: (for certain MO disks) use 2048-byte sectors
-v Give fdisk version
-------------------------------
Search for files in a directory hierarchy. The default PATH is the current directory; default EXPRESSION is '-print'
EXPRESSION may consist of:
-follow Dereference symbolic links.
-name PATTERN File name (leading directories removed) matches PATTERN.
-print Print (default and assumed).
-type X Filetype matches X (where X is one of: f,d,l,b,c,...)
-perm PERMS Permissions match any of (+NNN); all of (-NNN);
or exactly (NNN)
-mtime TIME Modified time is greater than (+N); less than (-N);
or exactly (N) days
-newer FILE Modified time is more recent than FILE's
-inum N File has inode number N
Example:
$ find / -name /etc/passwd
/etc/passwd
-------------------------------
Wrap input lines in each FILE (standard input by default), writing to standard output.
Options:
-b count bytes rather than columns
-s break at spaces
-w use WIDTH columns instead of 80
-------------------------------
Displays the amount of free and used system memory
Example:
$ free
total used free shared buffers
Mem: 257628 248724 8904 59644 93124
Swap: 128516 8404 120112
Total: 386144 257128 129016
-------------------------------
Frees all memory used by the specified ramdisk.
Example:
$ freeramdisk /dev/ram2
-------------------------------
Performs a consistency check for MINIX filesystems.
Options:
-l Lists all filenames
-r Perform interactive repairs
-a Perform automatic repairs
-v verbose
-s Outputs super-block information
-m Activates MINIX-like "mode not cleared" warnings
-f Force file system check.
-------------------------------
Retrieve a remote file via FTP.
Options:
-c, --continue Continue a previous transfer
-v, --verbose Verbose
-u, --username Username to be used
-p, --password Password to be used
-P, --port Port number to be used
-------------------------------
Store a local file on a remote machine via FTP.
Options:
-v, --verbose Verbose
-u, --username Username to be used
-p, --password Password to be used
-P, --port Port number to be used
-------------------------------
Parse command options
-a, --alternative Allow long options starting with single -
-l, --longoptions=longopts Long options to be recognized
-n, --name=progname The name under which errors are reported
-o, --options=optstring Short options to be recognized
-q, --quiet Disable error reporting by getopt(3)
-Q, --quiet-output No normal output
-s, --shell=shell Set shell quoting conventions
-T, --test Test for getopt(1) version
-u, --unqote Do not quote the output
Example:
$ cat getopt.test
#!/bin/sh
GETOPT=`getopt -o ab:c:: --long a-long,b-long:,c-long:: \
-n 'example.busybox' -- "$@"`
if [ $? != 0 ] ; then exit 1 ; fi
eval set -- "$GETOPT"
while true ; do
case $1 in
-a|--a-long) echo "Option a" ; shift ;;
-b|--b-long) echo "Option b, argument `$2'" ; shift 2 ;;
-c|--c-long)
case "$2" in
"") echo "Option c, no argument"; shift 2 ;;
*) echo "Option c, argument `$2'" ; shift 2 ;;
esac ;;
--) shift ; break ;;
*) echo "Internal error!" ; exit 1 ;;
esac
done
-------------------------------
Opens a tty, prompts for a login name, then invokes /bin/login
Options:
-h Enable hardware (RTS/CTS) flow control.
-i Do not display /etc/issue before running login.
-L Local line, so do not do carrier detect.
-m Get baud rate from modem's CONNECT status message.
-w Wait for a CR or LF before sending /etc/issue.
-n Do not prompt the user for a login name.
-f issue_file Display issue_file instead of /etc/issue.
-l login_app Invoke login_app instead of /bin/login.
-t timeout Terminate after timeout if no username is read.
-I initstring Sets the init string to send before anything else.
-H login_host Log login_host into the utmp file as the hostname.
-------------------------------
Search for PATTERN in each FILE or standard input.
Options:
-H prefix output lines with filename where match was found
-h suppress the prefixing filename on output
-i ignore case distinctions
-l list names of files that match
-n print line number with output lines
-q be quiet. Returns 0 if result was found, 1 otherwise
-v select non-matching lines
-s suppress file open/read error messages
Example:
$ grep root /etc/passwd
root:x:0:0:root:/root:/bin/bash
$ grep ^[rR]oo. /etc/passwd
root:x:0:0:root:/root:/bin/bash
-------------------------------
Uncompress FILE (or standard input if FILE is '-').
Options:
-c Write output to standard output
-t Test compressed file integrity
Example:
$ ls -la /tmp/BusyBox*
-rw-rw-r-- 1 andersen andersen 557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz
$ gunzip /tmp/BusyBox-0.43.tar.gz
$ ls -la /tmp/BusyBox*
-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar
-------------------------------
Compress FILE(s) with maximum compression.
When FILE is '-' or unspecified, reads standard input. Implies -c.
Options:
-c Write output to standard output instead of FILE.gz
-d decompress
Example:
$ ls -la /tmp/busybox*
-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/busybox.tar
$ gzip /tmp/busybox.tar
$ ls -la /tmp/busybox*
-rw-rw-r-- 1 andersen andersen 554058 Apr 14 17:49 /tmp/busybox.tar.gz
-------------------------------
Halt the system.
-------------------------------
Options: -a get/set fs readahead
-A set drive read-lookahead flag (0/1) -b get/set bus state (0 == off, 1 == on, 2 == tristate) -B set Advanced Power Management setting (1-255) -c get/set IDE 32-bit IO setting -C check IDE power mode status -d get/set using_dma flag -D enable/disable drive defect-mgmt -f flush buffer cache for device on exit -g display drive geometry -h display terse usage information -i display drive identification -I detailed/current information directly from drive -Istdin similar to -I, but wants /proc/ide/*/hd?/identify as input -k get/set keep_settings_over_reset flag (0/1) -K set drive keep_features_over_reset flag (0/1) -L set drive doorlock (0/1) (removable harddisks only) -m get/set multiple sector count -n get/set ignore-write-errors flag (0/1) -p set PIO mode on IDE interface chipset (0,1,2,3,4,...) -P set drive prefetch count -q change next setting quietly -Q get/set DMA tagged-queuing depth (if supported) -r get/set readonly flag (DANGEROUS to set) -R register an IDE interface (DANGEROUS) -S set standby (spindown) timeout -t perform device read timings -T perform cache read timings -u get/set unmaskirq flag (0/1) -U un-register an IDE interface (DANGEROUS) -v defaults; same as -mcudkrag for IDE drives -V display program version and exit immediately -w perform device reset (DANGEROUS) -W set drive write-caching flag (0/1) (DANGEROUS) -x tristate device for hotswap (0/1) (DANGEROUS) -X set IDE xfer mode (DANGEROUS) -y put IDE drive in standby mode -Y put IDE drive to sleep -Z disable Seagate auto-powersaving mode -z re-read partition table
-------------------------------
Print first 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With no FILE, or when FILE is -, read standard input.
Options:
-n NUM Print first NUM lines instead of first 10
-c NUM output the first NUM bytes
-q never output headers giving file names
-v always output headers giving file names
Example:
$ head -n 2 /etc/passwd
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
-------------------------------
The hexdump utility is a filter which displays the specified files, or the standard input, if no files are specified, in a user specified format
-b One-byte octal display
-c One-byte character display
-d Two-byte decimal display
-e FORMAT STRING
-f FORMAT FILE
-n LENGTH Interpret only length bytes of input
-o Two-byte octal display
-s OFFSET Skip offset byte
-v display all input data
-x Two-byte hexadecimal display
-------------------------------
Print out a unique 32-bit identifier for the machine.
-------------------------------
Get or set the hostname or DNS domain name. If a hostname is given (or FILE with the -F parameter), the host name will be set.
Options:
-s Short
-i Addresses for the hostname
-d DNS domain name
-f Fully qualified domain name
-F FILE Use the contents of FILE to specify the hostname
Example:
$ hostname
sage
-------------------------------
Listens for incoming http server requests. Options:
-c FILE Specifies configuration file. (default httpd.conf)
-p PORT Server port (default 80)
-u USER Set uid to USER after listening privilegies port
-r REALM Authentication Realm for Basic Authentication
-m PASS Crypt PASS with md5 algorithm
-e STRING Html encode STRING
-d STRING URL decode STRING
-------------------------------
Query and set the hardware clock (RTC)
Options:
-r read hardware clock and print result
-s set the system time from the hardware clock
-w set the hardware clock to the current system time
-u the hardware clock is kept in coordinated universal time
-l the hardware clock is kept in local time
-------------------------------
Print information for USERNAME or the current user
Options:
-g prints only the group ID
-u prints only the user ID
-c prints only the security context
", B<-n> print a name instead of a number (with for B<-ug>)
-r prints the real user ID instead of the effective ID (with -ug)
Example:
$ id
uid=1000(andersen) gid=1000(andersen)
-------------------------------
configure a network interface
Options: [add <address>[/<prefixlen>]] [del <address>[/<prefixlen>]]
[[-]broadcast [<address>]] [[-]pointopoint [<address>]]
[netmask <address>] [dstaddr <address>]
[outfill <NN>] [keepalive <NN>]
[hw ether <address>] [metric <NN>] [mtu <NN>]
[[-]trailers] [[-]arp] [[-]allmulti]
[multicast] [[-]promisc] [txqueuelen <NN>] [[-]dynamic]
[mem_start <NN>] [io_addr <NN>] [irq <NN>]
[up|down] ...
-------------------------------
Usage: ifdown <options> <ifaces...>
Options:
-h this help
-a de/configure all interfaces automatically
-i FILE use FILE for interface definitions
-n print out what would happen, but don't do it
(note that this option doesn't disable mappings)
-v print out what would happen before doing it
-m don't run any mappings
-f force de/configuration
-------------------------------
Usage: ifup <options> <ifaces...>
Options:
-h this help
-a de/configure all interfaces automatically
-i FILE use FILE for interface definitions
-n print out what would happen, but don't do it
(note that this option doesn't disable mappings)
-v print out what would happen before doing it
-m don't run any mappings
-f force de/configuration
-------------------------------
Usage: [-q len] [conf]
Option:
-q Sets the size of the socket listen queue to
the specified value. Default is 128.
-------------------------------
Init is the parent of all processes.
This version of init is designed to be run only by the kernel.
BusyBox init doesn't support multiple runlevels. The runlevels field of the /etc/inittab file is completely ignored by BusyBox init. If you want runlevels, use sysvinit.
BusyBox init works just fine without an inittab. If no inittab is found, it has the following default behavior:
::sysinit:/etc/init.d/rcS
::askfirst:/bin/sh
::ctrlaltdel:/sbin/reboot
::shutdown:/sbin/swapoff -a
::shutdown:/bin/umount -a -r
::restart:/sbin/init
if it detects that /dev/console is _not_ a serial console, it will also run:
tty2::askfirst:/bin/sh
tty3::askfirst:/bin/sh
tty4::askfirst:/bin/sh
If you choose to use an /etc/inittab file, the inittab entry format is as follows:
<id>:<runlevels>:<action>:<process>
<id>:
WARNING: This field has a non-traditional meaning for BusyBox init!
The id field is used by BusyBox init to specify the controlling tty for
the specified process to run on. The contents of this field are
appended to "/dev/" and used as-is. There is no need for this field to
be unique, although if it isn't you may have strange results. If this
field is left blank, the controlling tty is set to the console. Also
note that if BusyBox detects that a serial console is in use, then only
entries whose controlling tty is either the serial console or /dev/null
will be run. BusyBox init does nothing with utmp. We don't need no
stinkin' utmp.
<runlevels>:
The runlevels field is completely ignored.
<action>:
Valid actions include: sysinit, respawn, askfirst, wait,
once, restart, ctrlaltdel, and shutdown.
The available actions can be classified into two groups: actions
that are run only once, and actions that are re-run when the specified
process exits.
Run only-once actions:
'sysinit' is the first item run on boot. init waits until all
sysinit actions are completed before continuing. Following the
completion of all sysinit actions, all 'wait' actions are run.
'wait' actions, like 'sysinit' actions, cause init to wait until
the specified task completes. 'once' actions are asynchronous,
therefore, init does not wait for them to complete. 'restart' is
the action taken to restart the init process. By default this should
simply run /sbin/init, but can be a script which runs pivot_root or it
can do all sorts of other interesting things. The 'ctrlaltdel' init
actions are run when the system detects that someone on the system
console has pressed the CTRL-ALT-DEL key combination. Typically one
wants to run 'reboot' at this point to cause the system to reboot.
Finally the 'shutdown' action specifies the actions to taken when
init is told to reboot. Unmounting filesystems and disabling swap
is a very good here
Run repeatedly actions:
'respawn' actions are run after the 'once' actions. When a process
started with a 'respawn' action exits, init automatically restarts
it. Unlike sysvinit, BusyBox init does not stop processes from
respawning out of control. The 'askfirst' actions acts just like
respawn, except that before running the specified process it
displays the line "Please press Enter to activate this console."
and then waits for the user to press enter before starting the
specified process.
Unrecognized actions (like initdefault) will cause init to emit an
error message, and then go along with its business. All actions are
run in the order they appear in /etc/inittab.
<process>:
Specifies the process to be executed and it's command line.
Example /etc/inittab file:
# This is run first except when booting in single-user mode.
#
::sysinit:/etc/init.d/rcS
# /bin/sh invocations on selected ttys
#
# Start an "askfirst" shell on the console (whatever that may be)
::askfirst:-/bin/sh
# Start an "askfirst" shell on /dev/tty2-4
tty2::askfirst:-/bin/sh
tty3::askfirst:-/bin/sh
tty4::askfirst:-/bin/sh
# /sbin/getty invocations for selected ttys
#
tty4::respawn:/sbin/getty 38400 tty4
tty5::respawn:/sbin/getty 38400 tty5
# Example of how to put a getty on a serial line (for a terminal)
#
#::respawn:/sbin/getty -L ttyS0 9600 vt100
#::respawn:/sbin/getty -L ttyS1 9600 vt100
#
# Example how to put a getty on a modem line.
#::respawn:/sbin/getty 57600 ttyS2
# Stuff to do when restarting the init process
::restart:/sbin/init
# Stuff to do before rebooting
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r
::shutdown:/sbin/swapoff -a
-------------------------------
Loads the specified kernel modules into the kernel.
Options:
-f Force module to load into the wrong kernel version.
-k Make module autoclean-able.
-v verbose output
-L Lock to prevent simultaneous loads of a module
-m Output load map to stdout -x do not export externs
-------------------------------
Loads the specified kernel modules into the kernel.
-------------------------------
ip [ OPTIONS ] OBJECT { COMMAND | help } where OBJECT := { link | addr | route | tunnel } OPTIONS := { -f[amily] { inet | inet6 | link } | -o[neline] }
-------------------------------
ipaddr {add|del} IFADDR dev STRING ipaddr {show|flush} [ dev STRING ] [ scope SCOPE-ID ]
[ to PREFIX ] [ label PATTERN ]
IFADDR := PREFIX | ADDR peer PREFIX
[ broadcast ADDR ] [ anycast ADDR ]
[ label STRING ] [ scope SCOPE-ID ]
SCOPE-ID := [ host | link | global | NUMBER ]
-------------------------------
ipcalc provides a simple way to calculate IP information for a host. The various options specify what information ipcalc should display on standard out. Multiple options may be specified.
-------------------------------
iplink set DEVICE { up | down | arp { on | off } |
dynamic { on | off } |
mtu MTU }
iplink show [ DEVICE ]
-------------------------------
iproute { list | flush } SELECTOR iproute get ADDRESS [ from ADDRESS iif STRING ]
[ oif STRING ] [ tos TOS ]
iproute { add | del | change | append | replace | monitor } ROUTE
SELECTOR := [ root PREFIX ] [ match PREFIX ] [ proto RTPROTO ]
ROUTE := [ TYPE ] PREFIX [ tos TOS ] [ proto RTPROTO ]
-------------------------------
iptunnel { add | change | del | show } [ NAME ]
[ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]
[ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]
[ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]
-------------------------------
Send a signal (default is SIGTERM) to the specified process(es).
Options:
-l List all signal names and numbers.
Example:
$ ps | grep apache
252 root root S [apache]
263 www-data www-data S [apache]
264 www-data www-data S [apache]
265 www-data www-data S [apache]
266 www-data www-data S [apache]
267 www-data www-data S [apache]
$ kill 252
-------------------------------
Send a signal (default is SIGTERM) to the specified process(es).
Options:
-l List all signal names and numbers.
Example:
$ killall apache
-------------------------------
Kernel logger. Options:
-c n Sets the default log level of console messages to n.
-n Run as a foreground process.
-------------------------------
The BusyBox LAme SHell (command interpreter)
This command does not yet have proper documentation.
Use lash just as you would use any other shell. It properly handles pipes, redirects, job control, can be used as the shell for scripts, and has a sufficient set of builtins to do what is needed. It does not (yet) support Bourne Shell syntax. If you need things like ``if-then-else'', ``while'', and such use ash or bash. If you just need a very simple and extremely small shell, this will do the job.
-------------------------------
Shows listing of the last users that logged into the system
-------------------------------
Prints out the length of the specified STRING.
Example:
$ length Hello
5
-------------------------------
Create a link named LINK_NAME or DIRECTORY to the specified TARGET
You may use '--' to indicate that all following arguments are non-options.
Options:
-s make symbolic links instead of hard links
-f remove existing destination files
-n no dereference symlinks - treat like normal file
Example:
$ ln -s BusyBox /tmp/ls
$ ls -l /tmp/ls
lrwxrwxrwx 1 root root 7 Apr 12 18:39 ls -> BusyBox*
-------------------------------
Loads an acm from standard input.
Example:
$ loadacm < /etc/i18n/acmname
-------------------------------
Loads a console font from standard input.
Example:
$ loadfont < /etc/i18n/fontname
-------------------------------
Loads a binary keyboard translation table from standard input.
Example:
$ loadkmap < /etc/i18n/lang-keymap
-------------------------------
Write MESSAGE to the system log. If MESSAGE is omitted, log stdin.
Options:
-s Log to stderr as well as the system log.
-t Log using the specified tag (defaults to user name).
-p Enter the message with the specified priority.
This may be numerical or a ``facility.level'' pair.
Example:
$ logger "hello"
-------------------------------
Begin a new session on the system
Options:
-f Do not authenticate (user already authenticated)
-h Name of the remote host for this login.
-p Preserve environment.
-------------------------------
Print the name of the current user.
Example:
$ logname
root
-------------------------------
Shows the messages from syslogd (using circular buffer).
-------------------------------
Associate LOOPDEVICE with FILE.
Options:
-d Disassociate LOOPDEVICE.
-o OFFSET Start OFFSET bytes into FILE.
-------------------------------
List directory contents
Options:
-1 list files in a single column
-A do not list implied . and ..
-a do not hide entries starting with .
-C list entries by columns
-c with -l: show ctime
-d list directory entries instead of contents
-e list both full date and full time
-F append indicator (one of */=@|) to entries
-i list the i-node for each file
-l use a long listing format
-n list numeric UIDs and GIDs instead of names
-p append indicator (one of /=@|) to entries
-L list entries pointed to by symbolic links
-R list subdirectories recursively
-r sort the listing in reverse order
-S sort the listing by file size
-s list the size of each file, in blocks
-T NUM assume Tabstop every NUM columns
-t with -l: show modification time
-u with -l: show access time
-v sort the listing by version
-w NUM assume the terminal is NUM columns wide
-x list entries by lines instead of by columns
-X sort the listing by extension
-h print sizes in human readable format (e.g., 1K 243M 2G )
USAGE_SELINUX(" -k print security context
-K print security context in long format
", )
-------------------------------
List the currently loaded kernel modules.
-------------------------------
Creates a range of block or character special files
TYPEs include:
b: Make a block (buffered) device.
c or u: Make a character (un-buffered) device.
p: Make a named pipe. MAJOR and MINOR are ignored for named pipes.
FIRST specifies the number appended to NAME to create the first device. LAST specifies the number of the last item that should be created. If 's' is the last argument, the base device is created as well.
For example:
makedevs /dev/ttyS c 4 66 2 63 -> ttyS2-ttyS63
makedevs /dev/hda b 3 0 0 8 s -> hda,hda1-hda8
Example:
$ makedevs /dev/ttyS c 4 66 2 63
[creates ttyS2-ttyS63]
$ makedevs /dev/hda b 3 0 0 8 s
[creates hda,hda1-hda8]
-------------------------------
Print or check MD5 checksums.
Options: With no FILE, or when FILE is -, read standard input.
-b read files in binary mode
-c check MD5 sums against given list
-t read files in text mode (default)
-g read a string
The following two options are useful only when verifying checksums:
-s don't output anything, status code shows success
-w warn about improperly formated MD5 checksum lines
Example:
$ md5sum < busybox
6fd11e98b98a58f64ff3398d7b324003
$ md5sum busybox
6fd11e98b98a58f64ff3398d7b324003 busybox
$ md5sum -c -
6fd11e98b98a58f64ff3398d7b324003 busybox
busybox: OK
^D
-------------------------------
mesg [Y|N], controls write access to your terminal
y Allow write access to your terminal.
n Disallow write access to your terminal.
-------------------------------
[-spPrRC]
-------------------------------
Create the DIRECTORY(ies) if they do not already exist
Options:
-m set permission mode (as in chmod), not rwxrwxrwx - umask
-p no error if existing, make parent directories as needed
Example:
$ mkdir /tmp/foo
$ mkdir /tmp/foo
/tmp/foo: File exists
$ mkdir /tmp/foo/bar/baz
/tmp/foo/bar/baz: No such file or directory
$ mkdir -p /tmp/foo/bar/baz
-------------------------------
Creates a named pipe (identical to 'mknod name p')
Options:
-m create the pipe using the specified mode (default a=rw)
-------------------------------
Make a MINIX filesystem.
Options:
-c Check the device for bad blocks
-n [14|30] Specify the maximum length of filenames
-i INODES Specify the number of inodes for the filesystem
-l FILENAME Read the bad blocks list from FILENAME
-v Make a Minix version 2 filesystem
-------------------------------
Create a special file (block, character, or pipe).
Options:
-m create the special file using the specified mode (default a=rw)
TYPEs include:
b: Make a block (buffered) device.
c or u: Make a character (un-buffered) device.
p: Make a named pipe. MAJOR and MINOR are ignored for named pipes.
Example:
$ mknod /dev/fd0 b 2 0
$ mknod -m 644 /tmp/pipe p
-------------------------------
Prepare a disk partition to be used as a swap partition.
Options:
-c Check for read-ability.
-v0 Make version 0 swap [max 128 Megs].
-v1 Make version 1 swap [big!] (default for kernels >
2.1.117).
block-count Number of block to use (default is entire partition).
-------------------------------
Creates a temporary file with its name based on TEMPLATE. TEMPLATE is any name with six `Xs' (i.e., /tmp/temp.XXXXXX).
Example:
$ mktemp /tmp/temp.XXXXXX
/tmp/temp.mWiLjM
$ ls -la /tmp/temp.mWiLjM
-rw------- 1 andersen andersen 0 Apr 25 17:10 /tmp/temp.mWiLjM
-------------------------------
Used for high level module loading and unloading.
Example:
$ modprobe cdrom
-------------------------------
More is a filter for viewing FILE one screenful at a time.
Example:
$ dmesg | more
-------------------------------
Mount a filesystem
Flags:
-a: Mount all filesystems in fstab.
-f: "Fake" Add entry to mount table but don't mount it.
-n: Don't write a mount table entry.
-o option: One of many filesystem options, listed below.
-r: Mount the filesystem read-only.
-t fs-type: Specify the filesystem type.
-w: Mount for reading and writing (default).
Options for use with the ``-o'' flag:
async/sync: Writes are asynchronous / synchronous.
atime/noatime: Enable / disable updates to inode access times.
dev/nodev: Allow use of special device files / disallow them.
exec/noexec: Allow use of executable files / disallow them.
loop: Mounts a file via loop device.
suid/nosuid: Allow set-user-id-root programs / disallow them.
remount: Re-mount a mounted filesystem, changing its flags.
ro/rw: Mount for read-only / read-write.
bind: Use the linux 2.4.x "bind" feature.
There are EVEN MORE flags that are specific to each filesystem. You'll have to see the written documentation for those filesystems.
Example:
$ mount
/dev/hda3 on / type minix (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw)
$ mount /dev/fd0 /mnt -t msdos -o ro
$ mount /tmp/diskimage /opt -t ext2 -o loop
-------------------------------
[option] service Where option is one of
-u Up. If the service is not running, start it. If the service stops, restart it.
-d Down. If the service is running, stop it, do not restart it.
-o Once. If the service is not running, start it. Do not restart it if it stops.
-r Tell supervise that the service is normally running; this affects status messages.
-s Tell supervise that the service is normally stopped; this affects status messages.
-p Pause. Send the service a STOP signal.
-c Continue. Send the service a CONT signal.
-h Hangup. Send the service a HUP signal.
-a Alarm. Send the service an ALRM signal.
-i Interrupt. Send the service an INT signal.
-t Terminate. Send the service a TERM signal.
-k Kill. Send the service a KILL signal.
-x Exit. supervise will quit as soon as the service is down.
-------------------------------
Control magnetic tape drive operation
Available Opcodes:
bsf bsfm bsr bss datacompression drvbuffer eof eom erase fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2 ras3 reset retension rewind rewoffline seek setblk setdensity setpart tell unload unlock weof wset
-------------------------------
Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.
Example:
$ mv /tmp/foo /bin/bar
-------------------------------
Nameif renaming network interface while it in the down state.
Options:
-c FILE Use configuration file (default is /etc/mactab)
-s Use syslog (LOCAL0 facility).
IFNAME MACADDR new_interface_name interface_mac_address
Example:
$ nameif -s dmz0 00:A0:C9:8C:F6:3F
or
$ nameif -c /etc/my_mactab_file
-------------------------------
Netcat opens a pipe to IP:port
Options:
-l listen mode, for inbound connects
-p PORT local port number
-i SECS delay interval for lines sent
-e PROG program to exec after connect (dangerous!)
Example:
$ nc foobar.somedomain.com 25
220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600
help
214-Commands supported:
214- HELO EHLO MAIL RCPT DATA AUTH
214 NOOP QUIT RSET HELP
quit
221 foobar closing connection
-------------------------------
-l display listening server sockets -a display all sockets (default: connected) -e display other/more information -n don't resolve names -r display routing table -t tcp sockets -u udp sockets -w raw sockets -x unix sockets
-------------------------------
Queries the nameserver for the IP address of the given HOST optionally using a specified DNS server
Example:
$ nslookup localhost
Server: default
Address: default
Name: debian
Address: 127.0.0.1
-------------------------------
Write an unambiguous representation, octal bytes by default, of FILE to standard output. With no FILE, or when FILE is -, read standard input.
-------------------------------
Start a command on a new virtual terminal
Example:
openvt 2 /bin/ash
-------------------------------
Change a user password. If no name is specified, changes the password for the current user. Options:
-a Define which algorithm shall be used for the password.
(Choices: des, md5 PASSWORD_ALG_TYPES(", sha1") )
-d Delete the password for the specified user account.
-l Locks (disables) the specified user account.
-u Unlocks (re-enables) the specified user account.
-------------------------------
[-p<num>]
Example:
$ patch -p1 <example.diff
-------------------------------
service /var/run/daemon.pid /usr/sbin/daemon args...
-------------------------------
Lists the PIDs of all processes with names that match the names on the command line
Example:
$ pidof init
1
-------------------------------
Send ICMP ECHO_REQUEST packets to network hosts.
Options:
-c COUNT Send only COUNT pings.
-s SIZE Send SIZE data bytes in packets (default=56).
-q Quiet mode, only displays output at start
and when finished.
Example:
$ ping localhost
PING slag (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms
--- debian ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 20.1/20.1/20.1 ms
-------------------------------
Send ICMP ECHO_REQUEST packets to network hosts.
Options:
-c COUNT Send only COUNT pings.
-s SIZE Send SIZE data bytes in packets (default=56).
-q Quiet mode, only displays output at start
and when finished.
Example:
$ ping6 ip6-localhost
PING ip6-localhost (::1): 56 data bytes
64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms
--- ip6-localhost ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 20.1/20.1/20.1 ms
-------------------------------
Move the current root file system to PUT_OLD and make NEW_ROOT the new root file system.
-------------------------------
Halt the system and request that the kernel shut off the power.
-------------------------------
Formats and prints ARGUMENT(s) according to FORMAT,
Where FORMAT controls the output exactly as in C printf.
Example:
$ printf "Val=%d\n" 5
Val=5
-------------------------------
Report process status
Options:
-c show SE Linux context", "
This version of ps accepts no options.
Example:
$ ps
PID Uid Gid State Command
1 root root S init
2 root root S [kflushd]
3 root root S [kupdate]
4 root root S [kpiod]
5 root root S [kswapd]
742 andersen andersen S [bash]
743 andersen andersen S -bash
745 root root S [getty]
2990 andersen andersen R ps
-------------------------------
Print the full filename of the current working directory.
Example:
$ pwd
/root
-------------------------------
Start MD_DEVICE, taking superblock from DISK_DEVICE. Example: raid_start /dev/md0 /dev/sdb
-------------------------------
Get and possibly set the system date and time from a remote HOST.
Options:
-s Set the system date and time (default).
-p Print the date and time.
-------------------------------
Read a symbolic link.
-------------------------------
return the canonicalized absolute pathnames of given arguments
-------------------------------
Reboot the system.
-------------------------------
Changes priority of running processes. Allowed priorities range from 20 (the process runs only when nothing else is running) to 0 (default priority) to -20 (almost nothing else ever gets to run).
-------------------------------
Resets the screen.
-------------------------------
Remove (unlink) the FILE(s). You may use '--' to indicate that all following arguments are non-options.
Options:
-i always prompt before removing each destination
-f remove existing destinations, never prompt
-r or -R remove the contents of directories recursively
Example:
$ rm -rf /tmp/foo
-------------------------------
Remove the DIRECTORY(ies), if they are empty.
Example:
# rmdir /tmp/foo
-------------------------------
Unloads the specified kernel modules from the kernel.
Options:
-a Remove all unused modules (recursively)
Example:
$ rmmod tulip
-------------------------------
Edit the kernel's routing tables.
Options:
-n Dont resolve names.
-e Display other/more information
-------------------------------
Manipulates RPM packages
Options:
-i Install package
-q Query package
-p Query uninstalled package
-i Show information
-l List contents
-d List documents
-c List config files
-------------------------------
Outputs a cpio archive of the rpm file.
-------------------------------
Run a bunch of scripts in a directory.
Options:
-t Test only what file will be executed, without execute them.
-a ARG Pass ARG as an argument for every program invoked.
-u MASK Set the umask to MASK before executing every program.
-------------------------------
Options:
-n suppress automatic printing of pattern space
-e script add the script to the commands to be executed
-f scriptfile add the contents of script-file to the commands to be executed
If no -e or -f is given, the first non-option argument is taken as the sed script to interpret. All remaining arguments are names of input files; if no input files are specified, then the standard input is read.
Example:
$ echo "foo" | sed -e 's/f[a-zA-Z]o/bar/g'
bar
-------------------------------
Set entries into the kernel's scancode-to-keycode map, allowing unusual keyboards to generate usable keycodes.
SCANCODE may be either xx or e0xx (hexadecimal), and KEYCODE is given in decimal
Example:
$ setkeycodes e030 127
-------------------------------
[OPTION] [FILE]
-------------------------------
Pause for a time equal to the total of the args given, where each arg can
have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays.
Example:
$ sleep 2
[2 second delay results]
$ sleep 1d 3h 22m 8s
[98528 second delay results]
-------------------------------
Sorts lines of text in the specified files
Options:
-u suppress duplicate lines
-r sort in reverse order
-n sort numerics
Example:
$ echo -e "e\nf\nb\nd\nc\na" | sort
a
b
c
d
e
f
-------------------------------
Program to start and stop services. Options: -S start -K stop -b force process into background (daemonize) -x <executable> program to start/check if it is running -u <username>|<uid> stop this user's processes -n <process-name> stop processes with this name -s <signal> signal to send (default 15) -a <pathname> program to start (default <executable>)
-------------------------------
Display printable strings in a binary file.
Options:
-f Precede each string with the name of the file where it was found.
-n N Specifies that at least N characters forms a sequence (default 4)
-o Each string is preceded by its decimal offset in the file.
-------------------------------
Without arguments, prints baud rate, line discipline, and deviations from stty sane.
Options:
-F DEVICE open device instead of stdin
-a print all current settings in human-readable form
-g print in stty-readable form
[SETTING] see manpage
-------------------------------
Change user id or become root. Options:
-p Preserve environment
-------------------------------
Single user login Options:
-f Do not authenticate (user already authenticated)
-h Name of the remote host for this login.
-p Preserve environment.
-------------------------------
Stop swapping virtual memory pages on DEVICE.
Options:
-a Stop swapping on all swap devices
-------------------------------
Start swapping virtual memory pages on DEVICE.
Options:
-a Start swapping on all swap devices
-------------------------------
Write all buffered filesystem blocks to disk.
-------------------------------
Linux system and kernel logging utility. Note that this version of syslogd ignores /etc/syslog.conf.
Options:
-m NUM Interval between MARK lines (default=20min, 0=off)
-n Run as a foreground process
-O FILE Use an alternate log file (default=/var/log/messages)
-R HOST[:PORT] Log to IP or hostname on PORT (default PORT=514/UDP)
-L Log locally and via network logging (default is network only)
-C Log to a circular buffer (read the buffer using logread)
Example:
$ syslogd -R masterlog:514
$ syslogd -R 192.168.1.1:601
-------------------------------
Print last 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With no FILE, or when FILE is -, read standard input.
Options:
-c N[kbm] output the last N bytes
-n N[kbm] print last N lines instead of last 10
-f output data as the file grows
-q never output headers giving file names
-s SEC wait SEC seconds between reads with -f
-v always output headers giving file names
If the first character of N (bytes or lines) is a '+', output begins with the Nth item from the start of each file, otherwise, print the last N items in the file. N bytes may be suffixed by k (x1024), b (x512), or m (1024^2).
Example:
$ tail -n 1 /etc/resolv.conf
nameserver 10.0.0.1
-------------------------------
Create, extract, or list files from a tar file.
Options:
c create
x extract
t list
Archive format selection:
z Filter the archive through gzip
j Filter the archive through bzip2
File selection:
f name of TARFILE or "-" for stdin
O extract to stdout
exclude file to exclude
X file with names to exclude
C change to directory DIR before operation
v verbosely list files processed
Example:
$ zcat /tmp/tarball.tar.gz | tar -xf -
$ tar -cf /tmp/tarball.tar /usr/local
-------------------------------
Copy standard input to each FILE, and also to standard output.
Options:
-a append to the given FILEs, do not overwrite
-i ignore interrupt signals (SIGINT)
Example:
$ echo "Hello" | tee /tmp/foo
$ cat /tmp/foo
Hello
-------------------------------
Telnet is used to establish interactive communication with another computer over a network using the TELNET protocol.
-------------------------------
Telnetd listens for incoming TELNET connections on PORT. Options:
-p PORT listen for connections on PORT (default 23)
-l LOGIN exec LOGIN on connect (default /bin/sh)
-------------------------------
Checks file types and compares values returning an exit code determined by the value of EXPRESSION.
Example:
$ test 1 -eq 2
$ echo $?
1
$ test 1 -eq 1
$ echo $?
0
$ [ -d /etc ]
$ echo $?
0
$ [ -d /junk ]
$ echo $?
1
-------------------------------
Transfers a file from/to a tftp server using ``octet'' mode.
Options:
-l FILE Local FILE.
-r FILE Remote FILE.
-g Get file.
-p Put file.
-b SIZE Transfer blocks of SIZE octets.
-------------------------------
Runs the program COMMAND with arguments ARGS. When COMMAND finishes, COMMAND's resource usage information is displayed
Options:
-v Displays verbose resource usage information.
-------------------------------
top provides an view of processor activity in real time. This utility reads the status for all processes in /proc each <seconds> and shows the status for however many processes will fit on the screen. This utility will not show processes that are started after program startup, but it will show the EXIT status for and PIDs that exit while it is running.
-------------------------------
Update the last-modified date on the given FILE[s].
Options:
-c Do not create any files
Example:
$ ls -l /tmp/foo
/bin/ls: /tmp/foo: No such file or directory
$ touch /tmp/foo
$ ls -l /tmp/foo
-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo
-------------------------------
Translate, squeeze, and/or delete characters from standard input, writing to standard output.
Options:
-c take complement of STRING1
-d delete input characters coded STRING1
-s squeeze multiple output characters of STRING2 into one character
Example:
$ echo "gdkkn vnqkc" | tr [a-y] [b-z]
hello world
-------------------------------
| traceroute [-dnrv] [-m max_ttl] [-p port#] [-q nqueries] | |
| [-s src_addr] [-t tos] [-w wait] host [data size] |
trace the route ip packets follow going to ``host'' Options:
-d set SO_DEBUG options to socket
-n Print hop addresses numerically rather than symbolically
-r Bypass the normal routing tables and send directly to a host
-v Verbose output
-m max_ttl Set the max time-to-live (max number of hops)
-p port# Set the base UDP port number used in probes
(default is 33434)
-q nqueries Set the number of probes per ``ttl'' to nqueries
(default is 3)
-s src_addr Use the following IP address as the source address
-t tos Set the type-of-service in probe packets to the following value
(default 0)
-w wait Set the time (in seconds) to wait for a response to a probe
(default 3 sec.).
-------------------------------
Return an exit code of TRUE (0).
Example:
$ true
$ echo $?
0
-------------------------------
Print the file name of the terminal connected to standard input.
Options:
-s print nothing, only return an exit status
Example:
$ tty
/dev/tty2
-------------------------------
-c, --clientid=CLIENTID Client identifier
-H, --hostname=HOSTNAME Client hostname
-h, Alias for -H
-f, --foreground Do not fork after getting lease
-b, --background Fork to background if lease cannot be immediately negotiated.
-i, --interface=INTERFACE Interface to use (default: eth0)
-n, --now Exit with failure if lease cannot be immediately negotiated.
-p, --pidfile=file Store process ID of daemon in file
-q, --quit Quit after obtaining lease
-r, --request=IP IP address to request (default: none)
-s, --script=file Run file at dhcp events (default: /usr/share/udhcpc/default.script)
-v, --version Display version
-------------------------------
-------------------------------
Unmount file systems
Flags:
-a Unmount all file systems in /etc/mtab
-n Don't erase /etc/mtab entries
-r Try to remount devices as read-only if mount is busy
-f Force umount (i.e., unreachable NFS server)
-l Do not free loop device (if a loop device has been used)
Example:
$ umount /dev/hdc1
-------------------------------
Print certain system information. With no OPTION, same as -s.
Options:
-a print all information
-m the machine (hardware) type
-n print the machine's network node hostname
-r print the operating system release
-s print the operating system name
-p print the host processor type
-v print the operating system version
Example:
$ uname -a
Linux debian 2.2.15pre13 #5 Tue Mar 14 16:03:50 MST 2000 i686 unknown
-------------------------------
Uncompress .Z file[s] Options:
-c extract to stdout
-f force overwrite an existing file
-------------------------------
Discard all but one of successive identical lines from INPUT (or standard input), writing to OUTPUT (or standard output).
Options:
-c prefix lines by the number of occurrences
-d only print duplicate lines
-u only print unique lines
-f N skip the first N fields
-s N skip the first N chars (after any skipped fields)
Example:
$ echo -e "a\na\nb\nc\nc\na" | sort | uniq
a
b
c
-------------------------------
Converts FILE from unix format to dos format. When no option is given, the input is converted to the opposite output format. When no file is given, uses stdin for input and stdout for output. Options:
-u output will be in UNIX format
-d output will be in DOS format
-------------------------------
Extracts files from ZIP archives.
Options:
-l list archive contents (short form)
-n never overwrite existing files (default)
-o overwrite files without prompting
-p send output to stdout
-q be quiet
-x exclude these files
-d extract files into this directory
-------------------------------
Display the time since the last boot.
Example:
$ uptime
1:55pm up 2:30, load average: 0.09, 0.04, 0.00
-------------------------------
Pause for N microseconds.
Example:
$ usleep 1000000
[pauses for 1 second]
-------------------------------
Uudecode a file that is uuencoded.
Options:
-o FILE direct output to FILE
Example:
$ uudecode -o busybox busybox.uu
$ ls -l busybox
-rwxr-xr-x 1 ams ams 245264 Jun 7 21:35 busybox
-------------------------------
Uuencode a file.
Options:
-m use base64 encoding per RFC1521
Example:
$ uuencode busybox busybox
begin 755 busybox
<encoded file snipped>
$ uudecode busybox busybox > busybox.uu
$
-------------------------------
Usage: add [interface-name] [vlan_id]
rem [vlan-name]
set_flag [interface-name] [flag-num] [0 | 1]
set_egress_map [vlan-name] [skb_priority] [vlan_qos]
set_ingress_map [vlan-name] [skb_priority] [vlan_qos]
set_name_type [name-type]
-------------------------------
edit FILE.
Options:
-R Read-only- do not write to the file.
-------------------------------
Lock a virtual terminal. A password is required to unlock Options:
-a Lock all VTs
-------------------------------
Executes a program periodically. Options:
-n Loop period in seconds - default is 2.
Example:
$ watch date
Mon Dec 17 10:31:40 GMT 2000
Mon Dec 17 10:31:42 GMT 2000
Mon Dec 17 10:31:44 GMT 2000
-------------------------------
Periodically write to watchdog device DEV. Options:
-t Timer period in seconds - default is 30.
-------------------------------
Print line, word, and byte counts for each FILE, and a total line if more than one FILE is specified. With no FILE, read standard input.
Options:
-c print the byte counts
-l print the newline counts
-L print the length of the longest line
-w print the word counts
Example:
$ wc /etc/passwd
31 46 1365 /etc/passwd
-------------------------------
| wget [-c|--continue] [-q|--quiet] [-O|--output-document file] | |
| [--header 'header: value'] [-Y|--proxy on/off] [-P DIR] url |
wget retrieves files via HTTP or FTP
Options:
-c continue retrieval of aborted transfers
-q quiet mode - do not print
-P Set directory prefix to DIR
-O save to filename ('-' for stdout)
-Y use proxy ('on' or 'off')
-------------------------------
Locates a COMMAND.
Example:
$ which login
/bin/login
-------------------------------
Prints the current user names and related information
-------------------------------
Prints the user name associated with the current effective user id.
-------------------------------
Executes COMMAND on every item given by standard input.
Options:
-p Prompt the user about whether to run each command
-r Do not run command for empty readed lines
-t Print the command line on stderr before executing it.
Example:
$ ls | xargs gzip
$ find . -name '*.c' -print | xargs rm
-------------------------------
Repeatedly outputs a line with all specified STRING(s), or 'y'.
-------------------------------
Uncompress to stdout.
-------------------------------
GNU Libc uses the Name Service Switch (NSS) to configure the behavior of the C library for the local environment, and to configure how it reads system data, such as passwords and group information. BusyBox has made it Policy that it will never use NSS, and will never use and libc calls that make use of NSS. This allows you to run an embedded system without the need for installing an /etc/nsswitch.conf file and without and /lib/libnss_* libraries installed.
If you are using a system that is using a remote LDAP server for authentication via GNU libc NSS, and you want to use BusyBox, then you will need to adjust the BusyBox source. Chances are though, that if you have enough space to install of that stuff on your system, then you probably want the full GNU utilities.
textutils(1), shellutils(1), etc...
Erik Andersen <andersen@codepoet.org>
The following people have contributed code to BusyBox whether they know it or not.
Erik Andersen <andersen@codepoet.org>
Tons of new stuff, major rewrite of most of the
core apps, tons of new apps as noted in header files.
John Beppu <beppu@codepoet.org>
du, head, nslookup, sort, tee, uniq (so Kraai could rewrite them ;-),
documentation
Edward Betts <edward@debian.org>
expr, hostid, logname, tty, wc, whoami, yes
=for html <br>
Brian Candler <B.Candler@pobox.com>
tiny-ls(ls)
Randolph Chung <tausq@debian.org>
fbset, ping, hostname, and mkfifo
Dave Cinege <dcinege@psychosis.com>
more(v2), makedevs, dutmp, modularization, auto links file,
various fixes, Linux Router Project maintenance
Larry Doolittle <ldoolitt@recycle.lbl.gov>
various fixes, shell rewrite
Karl M. Hegbloom <karlheg@debian.org>
cp_mv.c, the test suite, various fixes to utility.c, &c.
Sterling Huxley <sterling@europa.com>
vi (!!!)
Daniel Jacobowitz <dan@debian.org>
mktemp.c
Matt Kraai <kraai@alumni.carnegiemellon.edu>
documentation, bugfixes
John Lombardo <john@deltanet.com>
dirname, tr
Glenn McGrath <bug1@netconnect.com.au>
ar.c
Vladimir Oleynik <dzo@simtreas.ru>
cmdedit, xargs(current), httpd(current);
ports: ash, crond, fdisk, inetd, stty, traceroute, top;
locale, various fixes
and irreconcilable critic of everything not perfect.
Bruce Perens <bruce@pixar.com>
Original author of BusyBox. His code is still in many apps.
Chip Rosenthal <chip@unicom.com>, <crosenth@covad.com>
wget - Contributed by permission of Covad Communications
Pavel Roskin <proski@gnu.org>
Lots of bugs fixes and patches.
Gyepi Sam <gyepi@praxis-sw.com>
Remote logging feature for syslogd
Linus Torvalds <torvalds@transmeta.com>
mkswap, fsck.minix, mkfs.minix
Mark Whitley <markw@codepoet.org>
sed remix, bug fixes, style-guide, etc.
Charles P. Wright <cpwright@villagenet.com>
gzip, mini-netcat(nc)
Enrique Zanardi <ezanardi@ull.es>
tarcat (since removed), loadkmap, various fixes, Debian maintenance
Glenn Engel <glenne@engel.org>
httpd