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Man Pages
BUSYBOX(1) busybox BUSYBOX(1)
 

BusyBox - The Swiss Army Knife of Embedded Linux

 busybox <applet> [arguments...]  # or
 <applet> [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 GNU coreutils, util-linux, etc. 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 /dev, /etc, and a Linux kernel. BusyBox provides a fairly complete POSIX environment for any small or embedded system.
BusyBox is extremely configurable. This allows you to include only the components you need, thereby reducing binary size. Run 'make config' or 'make menuconfig' to select the functionality that you wish to enable. Then run 'make' to compile BusyBox using your configuration.
After the compile has finished, you should use 'make install' to install BusyBox. This will install the 'bin/busybox' binary, in the target directory specified by CONFIG_PREFIX. CONFIG_PREFIX can be set when configuring BusyBox, or you can specify an alternative location at install time (i.e., with a command line like 'make CONFIG_PREFIX=/tmp/foo install'). If you enabled any applet installation scheme (either as symlinks or hardlinks), these will also be installed in the location pointed to by CONFIG_PREFIX.

BusyBox is a multi-call binary. A multi-call binary is an executable program that performs the same job as more than one utility program. That means there is just a single BusyBox binary, but that single binary acts like a large number of utilities. This allows BusyBox to be smaller since all the built-in utility programs (we call them applets) can share code for many common operations.
You can also invoke BusyBox by issuing a command as an argument on the command line. For example, entering
        /bin/busybox ls
will also cause BusyBox to behave as 'ls'.
Of course, adding '/bin/busybox' into every command would be painful. So most people will invoke BusyBox using links to the BusyBox binary.
For example, entering
        ln -s /bin/busybox ls
        ./ls
will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled into BusyBox). Generally speaking, you should never need to make all these links yourself, as the BusyBox build system will do this for you when you run the 'make install' command.
If you invoke BusyBox with no arguments, it will provide you with a list of the applets that have been compiled into your BusyBox binary.

Most BusyBox applets support the --help argument to provide a terse runtime description of their behavior. If the CONFIG_FEATURE_VERBOSE_USAGE option has been enabled, more detailed usage information will also be available.

Currently available applets include:
        addgroup, ar, ash, awk, basename, bunzip2, bzip2, cal, cat, catv,
        chattr, chgrp, chmod, chown, chroot, chrt, cksum, clear, cmp, comm,
        cp, cpio, crontab, cut, dc, dd, delgroup, diff, dirname, dnsd,
        dos2unix, du, echo, ed, env, expand, expr, fakeidentd, false,
        fatattr, find, flock, fold, fsync, ftpd, ftpget, ftpput, getopt,
        grep, groups, gunzip, gzip, hd, head, hexdump, hostid, hostname,
        httpd, id, install, iostat, ipcalc, kill, killall, killall5, less,
        ln, logger, logname, logread, lpq, lpr, ls, lsof, lspci, lsusb,
        lzma, lzop, md5sum, microcom, mkdir, mkfifo, mktemp, more, mpstat,
        mv, nc, nice, nohup, od, patch, pgrep, pipe_progress, pkill, pmap,
        powertop, printenv, printf, ps, pscan, pstree, pwd, pwdx, readlink,
        readprofile, realpath, renice, reset, resize, rev, rm, rmdir, rpm,
        rpm2cpio, run-parts, scriptreplay, sed, seq, setsid, sh, sha1sum,
        sha256sum, sha3sum, sha512sum, shuf, sleep, smemcap, sort, split,
        strings, sum, sync, sysctl, syslogd, tail, tar, tee, telnet,
        telnetd, test, tftp, tftpd, timeout, touch, tr, true, truncate, tty,
        ttysize, uname, uncompress, unexpand, uniq, unix2dos, unlink,
        unlzma, unxz, unzip, usleep, uudecode, uuencode, vi, volname, watch,
        wc, wget, which, whoami, xargs, xz, yes

addgroup
addgroup [-g GID] [-S] [USER] GROUP
Add a group or add a user to a group
        -g GID  Group id
        -S      Create a system group
    
ar
ar [-o] [-v] [-p] [-t] [-x] ARCHIVE FILES
Extract or list FILES from an ar archive
        -o      Preserve original dates
        -p      Extract to stdout
        -t      List
        -x      Extract
        -v      Verbose
    
ash
ash [-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]
Unix shell interpreter
awk
awk [OPTIONS] [AWK_PROGRAM] [FILE]...
        -v VAR=VAL      Set variable
        -F SEP          Use SEP as field separator
        -f FILE         Read program from FILE
        -e AWK_PROGRAM
    
basename
basename FILE [SUFFIX]
Strip directory path and .SUFFIX from FILE
bunzip2
bunzip2 [-cf] [FILE]...
Decompress FILEs (or stdin)
        -c      Write to stdout
        -f      Force
    
bzip2
bzip2 [OPTIONS] [FILE]...
Compress FILEs (or stdin) with bzip2 algorithm
        -1..9   Compression level
        -d      Decompress
        -c      Write to stdout
        -f      Force
    
cal
cal [-jy] [[MONTH] YEAR]
Display a calendar
        -j      Use julian dates
        -y      Display the entire year
    
cat
cat [FILE]...
Concatenate FILEs and print them to stdout
catv
catv [-etv] [FILE]...
Display nonprinting characters as ^x or M-x
        -e      End each line with $
        -t      Show tabs as ^I
        -v      Don't use ^x or M-x escapes
    
chattr
chattr [-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]...
Change ext2 file attributes
Modifiers:n -,+,= Remove/add/set attributes Attributes:n A Don't track atime a Append mode only c Enable compress D Write dir contents synchronously d Don't backup with dump i Cannot be modified (immutable) j Write all data to journal first s Zero disk storage when deleted S Write synchronously t Disable tail-merging of partial blocks with other files u Allow file to be undeleted -R Recurse -v VER Set version/generation number
chgrp
chgrp [-RhLHP]... GROUP FILE...
Change the group membership of each FILE to GROUP
        -R      Recurse
        -h      Affect symlinks instead of symlink targets
        -L      Traverse all symlinks to directories
        -H      Traverse symlinks on command line only
        -P      Don't traverse symlinks (default)
    
chmod
chmod [-R] MODE[,MODE]... FILE...
Each MODE is one or more of the letters ugoa, one of the symbols +-= and one or more of the letters rwxst
        -R      Recurse
    
chown
chown [-Rh]... USER[:[GRP]] FILE...
Change the owner and/or group of each FILE to USER and/or GRP
        -R      Recurse
        -h      Affect symlinks instead of symlink targets
    
chroot
chroot NEWROOT [PROG ARGS]
Run PROG with root directory set to NEWROOT
chrt
chrt [-prfom] [PRIO] [PID | PROG ARGS]
Change scheduling priority and class for a process
        -p      Operate on PID
        -r      Set SCHED_RR class
        -f      Set SCHED_FIFO class
        -o      Set SCHED_OTHER class
        -m      Show min/max priorities
    
cksum
cksum FILES...
Calculate the CRC32 checksums of FILES
clear
clear
Clear screen
cmp
cmp [-l] [-s] FILE1 [FILE2]
Compare FILE1 with FILE2 (or stdin)
        -l      Write the byte numbers (decimal) and values (octal)
                for all differing bytes
        -s      Quiet
    
comm
comm [-123] FILE1 FILE2
Compare FILE1 with FILE2
        -1      Suppress lines unique to FILE1
        -2      Suppress lines unique to FILE2
        -3      Suppress lines common to both files
    
cp
cp [OPTIONS] SOURCE... DEST
Copy SOURCE(s) to DEST
        -a      Same as -dpR
        -R,-r   Recurse
        -d,-P   Preserve symlinks (default if -R)
        -L      Follow all symlinks
        -H      Follow symlinks on command line
        -p      Preserve file attributes if possible
        -f      Overwrite
        -i      Prompt before overwrite
        -l,-s   Create (sym)links
        -u      Copy only newer files
    
cpio
cpio [-dmvu] [-F FILE] [-R USER[:GRP]] [-ti] [EXTR_FILE]...
Extract (-i) or list (-t) files from a cpio archive
Main operation mode:n -t List -i Extract EXTR_FILEs (or all) Options:n -d Make leading directories -m Preserve mtime -v Verbose -u Overwrite -F FILE Input (-t,-i,-p) or output (-o) file -R USER[:GRP] Set owner of created files
crontab
crontab [-c DIR] [-u USER] [-ler]|[FILE]
        -c      Crontab directory
        -u      User
        -l      List crontab
        -e      Edit crontab
        -r      Delete crontab
        FILE    Replace crontab by FILE ('-': stdin)
    
cut
cut [OPTIONS] [FILE]...
Print selected fields from each input FILE to stdout
        -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
    
dc
dc EXPRESSION...
Tiny RPN calculator. Operations: +, add, -, sub, *, mul, /, div, %, mod, **, exp, and, or, not, xor, p - print top of the stack (without popping), f - print entire stack, o - pop the value and set output radix (must be 10, 16, 8 or 2). Examples: 'dc 2 2 add p' -> 4, 'dc 8 8 mul 2 2 + / p' -> 16
dd
dd [if=FILE] [of=FILE] [ibs=N] [obs=N] [bs=N] [count=N] [skip=N] [seek=N] [conv=notrunc|noerror|sync|fsync] [iflag=skip_bytes]
Copy a file with converting and formatting
        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
        ibs=N           Read N bytes at a time
        obs=N           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
        conv=fsync      Physically write data out before finishing
        conv=swab       Swap every pair of bytes
        iflag=skip_bytes        skip=N is in bytes
        status=noxfer   Suppress rate output
        status=none     Suppress all output
    
N may be suffixed by c (1), w (2), b (512), kB (1000), k (1024), MB, M, GB, G
delgroup
delgroup [USER] GROUP
Delete group GROUP from the system or user USER from group GROUP
diff
diff [-abBdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2
Compare files line by line and output the differences between them. This implementation supports unified diffs only.
        -a      Treat all files as text
        -b      Ignore changes in the amount of whitespace
        -B      Ignore changes whose lines are all blank
        -d      Try hard to find a smaller set of changes
        -i      Ignore case differences
        -L      Use LABEL instead of the filename in the unified header
        -N      Treat absent files as empty
        -q      Output only whether files differ
        -r      Recurse
        -S      Start with FILE when comparing directories
        -T      Make tabs line up by prefixing a tab when necessary
        -s      Report when two files are the same
        -t      Expand tabs to spaces in output
        -U      Output LINES lines of context
        -w      Ignore all whitespace
    
dirname
dirname FILENAME
Strip non-directory suffix from FILENAME
dnsd
dnsd [-dvs] [-c CONFFILE] [-t TTL_SEC] [-p PORT] [-i ADDR]
Small static DNS server daemon
        -c FILE Config file
        -t SEC  TTL
        -p PORT Listen on PORT
        -i ADDR Listen on ADDR
        -d      Daemonize
        -v      Verbose
        -s      Send successful replies only. Use this if you want
                to use /etc/resolv.conf with two nameserver lines:
                        nameserver DNSD_SERVER
                        nameserver NORMAL_DNS_SERVER
    
dos2unix
dos2unix [-ud] [FILE]
Convert FILE in-place from DOS to Unix format. When no file is given, use stdin/stdout.
        -u      dos2unix
        -d      unix2dos
    
du
du [-aHLdclsxhmk] [FILE]...
Summarize disk space used for each FILE and/or directory
        -a      Show file sizes too
        -L      Follow all symlinks
        -H      Follow symlinks on command line
        -d N    Limit output to directories (and files with -a) of depth < N
        -c      Show 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      Sizes in human readable format (e.g., 1K 243M 2G)
        -m      Sizes in megabytes
        -k      Sizes in kilobytes (default)
    
echo
echo [-neE] [ARG]...
Print the specified ARGs to stdout
        -n      Suppress trailing newline
        -e      Interpret backslash escapes (i.e., \t=tab)
        -E      Don't interpret backslash escapes (default)
    
ed
ed
env
env [-iu] [-] [name=value]... [PROG ARGS]
Print the current environment or run PROG after setting up the specified environment
        -, -i   Start with an empty environment
        -u      Remove variable from the environment
    
expand
expand [-i] [-t N] [FILE]...
Convert tabs to spaces, writing to stdout
        -i,--initial    Don't convert tabs after non blanks
        -t,--tabs=N     Tabstops every N chars
    
expr
expr EXPRESSION
Print the value of EXPRESSION to stdout
EXPRESSION may be:n 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 1 if ARG1 is less than ARG2, else 0. Similarly: ARG1 <= ARG2 ARG1 = ARG2 ARG1 != ARG2 ARG1 >= ARG2 ARG1 > ARG2 ARG1 + ARG2 Sum of ARG1 and ARG2. Similarly: ARG1 - ARG2 ARG1 * ARG2 ARG1 / ARG2 ARG1 % 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.
fakeidentd
fakeidentd [-fiw] [-b ADDR] [STRING]
Provide fake ident (auth) service
        -f      Run in foreground
        -i      Inetd mode
        -w      Inetd 'wait' mode
        -b ADDR Bind to specified address
        STRING  Ident answer string (default: nobody)
    
fatattr
fatattr [-+rhsvda] FILE...
Change file attributes on FAT filesystem
        -       Clear attributes
        +       Set attributes
        r       Read only
        h       Hidden
        s       System
        v       Volume label
        d       Directory
        a       Archive
    
find
find [-HL] [PATH]... [OPTIONS] [ACTIONS]
Search for files and perform actions on them. First failed action stops processing of current file. Defaults: PATH is current directory, action is '-print'
        -L,-follow      Follow symlinks
        -H              ...on command line only
        -xdev           Don't descend directories on other filesystems
        -maxdepth N     Descend at most N levels. -maxdepth 0 applies
                        actions to command line arguments only
        -mindepth N     Don't act on first N levels
        -depth          Act on directory *after* traversing it
    
Actions:n ( ACTIONS ) Group actions for -o / -a ! ACT Invert ACT's success/failure ACT1 [-a] ACT2 If ACT1 fails, stop, else do ACT2 ACT1 -o ACT2 If ACT1 succeeds, stop, else do ACT2 Note: -a has higher priority than -o -name PATTERN Match file name (w/o directory name) to PATTERN -iname PATTERN Case insensitive -name -path PATTERN Match path to PATTERN -ipath PATTERN Case insensitive -path -regex PATTERN Match path to regex PATTERN -type X File type is X (one of: f,d,l,b,c,...) -perm MASK At least one mask bit (+MASK), all bits (-MASK), or exactly MASK bits are set in file's mode -mtime DAYS mtime is greater than (+N), less than (-N), or exactly N days in the past -mmin MINS mtime is greater than (+N), less than (-N), or exactly N minutes in the past -newer FILE mtime is more recent than FILE's -inum N File has inode number N -user NAME/ID File is owned by given user -group NAME/ID File is owned by given group -size N[bck] File size is N (c:bytes,k:kbytes,b:512 bytes(def.)) +/-N: file size is bigger/smaller than N -links N Number of links is greater than (+N), less than (-N), or exactly N -prune If current file is directory, don't descend into it If none of the following actions is specified, -print is assumed -print Print file name -print0 Print file name, NUL terminated -exec CMD ARG ; Run CMD with all instances of {} replaced by file name. Fails if CMD exits with nonzero -exec CMD ARG + Run CMD with {} replaced by list of file names -delete Delete current file/directory. Turns on -depth option
flock
flock [-sxun] FD|{FILE [-c] PROG ARGS}
[Un]lock file descriptor, or lock FILE, run PROG
        -s      Shared lock
        -x      Exclusive lock (default)
        -u      Unlock FD
        -n      Fail rather than wait
    
fold
fold [-bs] [-w WIDTH] [FILE]...
Wrap input lines in each FILE (or stdin), writing to stdout
        -b      Count bytes rather than columns
        -s      Break at spaces
        -w      Use WIDTH columns instead of 80
    
fsync
fsync [-d] FILE...
Write files' buffered blocks to disk
        -d      Avoid syncing metadata
    
ftpd
ftpd [-wvS] [-t N] [-T N] [DIR]
Anonymous FTP server
ftpd should be used as an inetd service. ftpd's line for inetd.conf: 21 stream tcp nowait root ftpd ftpd /files/to/serve It also can be ran from tcpsvd:n tcpsvd -vE 0.0.0.0 21 ftpd /files/to/serve
        -w      Allow upload
        -v      Log errors to stderr. -vv: verbose log
        -S      Log errors to syslog. -SS: verbose log
        -t,-T   Idle and absolute timeouts
        DIR     Change root to this directory
    
ftpget
ftpget [OPTIONS] HOST [LOCAL_FILE] REMOTE_FILE
Download a file via FTP
        -c,--continue           Continue previous transfer
        -v,--verbose            Verbose
        -u,--username USER      Username
        -p,--password PASS      Password
        -P,--port NUM           Port
    
ftpput
ftpput [OPTIONS] HOST [REMOTE_FILE] LOCAL_FILE
Upload a file to a FTP server
        -v,--verbose            Verbose
        -u,--username USER      Username
        -p,--password PASS      Password
        -P,--port NUM           Port
    
getopt
getopt [OPTIONS] [--] OPTSTRING PARAMS
        -a,--alternative                Allow long options starting with single -
        -l,--longoptions=LOPT[,...]     Long options to recognize
        -n,--name=PROGNAME              The name under which errors are reported
        -o,--options=OPTSTRING          Short options to recognize
        -q,--quiet                      No error messages on unrecognized options
        -Q,--quiet-output               No normal output
        -s,--shell=SHELL                Set shell quoting conventions
        -T,--test                       Version test (exits with 4)
        -u,--unquoted                   Don't quote output
    
Example:n
O=`getopt -l bb: -- ab:c:: "$@"` || exit 1 eval set -- "$O" while true; do case "$1" in -a) echo A; shift;; -b|--bb) echo "B:'$2'"; shift 2;; -c) case "$2" in "") echo C; shift 2;; *) echo "C:'$2'"; shift 2;; esac;; --) shift; break;; *) echo Error; exit 1;; esac done
grep
grep [-HhnlLoqvsriwFE] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f FILE [FILE]...
Search for PATTERN in FILEs (or stdin)
        -H      Add 'filename:' prefix
        -h      Do not add 'filename:' prefix
        -n      Add 'line_no:' prefix
        -l      Show only names of files that match
        -L      Show only names of files that don't match
        -c      Show only count of matching lines
        -o      Show only the matching part of line
        -q      Quiet. Return 0 if PATTERN is found, 1 otherwise
        -v      Select non-matching lines
        -s      Suppress open and read errors
        -r      Recurse
        -i      Ignore case
        -w      Match whole words only
        -x      Match whole lines only
        -F      PATTERN is a literal (not regexp)
        -E      PATTERN is an extended regexp
        -m N    Match up to N times per file
        -A N    Print N lines of trailing context
        -B N    Print N lines of leading context
        -C N    Same as '-A N -B N'
        -e PTRN Pattern to match
        -f FILE Read pattern from file
    
groups
groups [USER]
Print the group memberships of USER or for the current process
gunzip
gunzip [-cft] [FILE]...
Decompress FILEs (or stdin)
        -c      Write to stdout
        -f      Force
        -t      Test file integrity
    
gzip
gzip [-cfd] [FILE]...
Compress FILEs (or stdin)
        -d      Decompress
        -c      Write to stdout
        -f      Force
    
hd
hd FILE...
hd is an alias for hexdump -C
head
head [OPTIONS] [FILE]...
Print first 10 lines of each FILE (or stdin) to stdout. With more than one FILE, precede each with a filename header.
        -n N[kbm]       Print first N lines
        -n -N[kbm]      Print all except N last lines
        -c [-]N[kbm]    Print first N bytes
        -q              Never print headers
        -v              Always print headers
    
N may be suffixed by k (x1024), b (x512), or m (x1024^2).
hexdump
hexdump [-bcCdefnosvx] [FILE]...
Display FILEs (or stdin) in a user specified format
        -b              One-byte octal display
        -c              One-byte character display
        -C              Canonical hex+ASCII, 16 bytes per line
        -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 bytes
        -v              Display all input data
        -x              Two-byte hexadecimal display
    
hostid
hostid
Print out a unique 32-bit identifier for the machine
hostname
hostname [OPTIONS] [HOSTNAME | -F FILE]
Get or set hostname or DNS domain name
        -s      Short
        -i      Addresses for the hostname
        -d      DNS domain name
        -f      Fully qualified domain name
        -F FILE Use FILE's content as hostname
    
httpd
httpd [-ifv[v]] [-c CONFFILE] [-p [IP:]PORT] [-r REALM] [-h HOME] or httpd -d/-e/-m STRING
Listen for incoming HTTP requests
        -i              Inetd mode
        -f              Don't daemonize
        -v[v]           Verbose
        -p [IP:]PORT    Bind to IP:PORT (default *:80)
        -r REALM        Authentication Realm for Basic Authentication
        -h HOME         Home directory (default .)
        -c FILE         Configuration file (default {/etc,HOME}/httpd.conf)
        -m STRING       MD5 crypt STRING
        -e STRING       HTML encode STRING
        -d STRING       URL decode STRING
    
id
id [OPTIONS] [USER]
Print information about USER or the current user
        -u      User ID
        -g      Group ID
        -G      Supplementary group IDs
        -n      Print names instead of numbers
        -r      Print real ID instead of effective ID
    
install
install [-cdDsp] [-o USER] [-g GRP] [-m MODE] [-t DIR] [SOURCE]... DEST
Copy files and set attributes
        -c      Just copy (default)
        -d      Create directories
        -D      Create leading target directories
        -s      Strip symbol table
        -p      Preserve date
        -o USER Set ownership
        -g GRP  Set group ownership
        -m MODE Set permissions
        -t DIR  Install to DIR
    
iostat
iostat [-c] [-d] [-t] [-z] [-k|-m] [ALL|BLOCKDEV...] [INTERVAL [COUNT]]
Report CPU and I/O statistics
        -c      Show CPU utilization
        -d      Show device utilization
        -t      Print current time
        -z      Omit devices with no activity
        -k      Use kb/s
        -m      Use Mb/s
    
ipcalc
ipcalc [OPTIONS] ADDRESS[/PREFIX] [NETMASK]
Calculate IP network settings from a IP address
        -b,--broadcast  Display calculated broadcast address
        -n,--network    Display calculated network address
        -m,--netmask    Display default netmask for IP
        -p,--prefix     Display the prefix for IP/NETMASK
        -h,--hostname   Display first resolved host name
        -s,--silent     Don't ever display error messages
    
kill
kill [-l] [-SIG] PID...
Send a signal (default: TERM) to given PIDs
        -l      List all signal names and numbers
    
killall
killall [-l] [-q] [-SIG] PROCESS_NAME...
Send a signal (default: TERM) to given processes
        -l      List all signal names and numbers
        -q      Don't complain if no processes were killed
    
killall5
killall5 [-l] [-SIG] [-o PID]...
Send a signal (default: TERM) to all processes outside current session
        -l      List all signal names and numbers
        -o PID  Don't signal this PID
    
less
less [-EIMmNSh~] [FILE]...
View FILE (or stdin) one screenful at a time
        -E      Quit once the end of a file is reached
        -I      Ignore case in all searches
        -M,-m   Display status line with line numbers
                and percentage through the file
        -N      Prefix line number to each line
        -S      Truncate long lines
        -~      Suppress ~s displayed past EOF
    
ln
ln [OPTIONS] TARGET... LINK|DIR
Create a link LINK or DIR/TARGET to the specified TARGET(s)
        -s      Make symlinks instead of hardlinks
        -f      Remove existing destinations
        -n      Don't dereference symlinks - treat like normal file
        -b      Make a backup of the target (if exists) before link operation
        -S suf  Use suffix instead of ~ when making backup files
        -T      2nd arg must be a DIR
        -v      Verbose
    
logger
logger [OPTIONS] [MESSAGE]
Write MESSAGE (or stdin) to syslog
        -s      Log to stderr as well as the system log
        -t TAG  Log using the specified tag (defaults to user name)
        -p PRIO Priority (numeric or facility.level pair)
    
logname
logname
Print the name of the current user
logread
logread [-fF]
Show messages in syslogd's circular buffer
        -f      Output data as log grows
        -F      Same as -f, but dump buffer first
    
lpq
lpq [-P queue[@host[:port]]] [-U USERNAME] [-d JOBID]... [-fs]
        -P      lp service to connect to (else uses $PRINTER)
        -d      Delete jobs
        -f      Force any waiting job to be printed
        -s      Short display
    
lpr
lpr -P queue[@host[:port]] -U USERNAME -J TITLE -Vmh [FILE]...
        -P      lp service to connect to (else uses $PRINTER)
        -m      Send mail on completion
        -h      Print banner page too
        -V      Verbose
    
ls
ls [-1AaCxdLHRFplinsehrSXvctu] [-w WIDTH] [FILE]...
List directory contents
        -1      One column output
        -a      Include entries which start with .
        -A      Like -a, but exclude . and ..
        -C      List by columns
        -x      List by lines
        -d      List directory entries instead of contents
        -L      Follow symlinks
        -H      Follow symlinks on command line
        -R      Recurse
        -p      Append / to dir entries
        -F      Append indicator (one of */=@|) to entries
        -l      Long listing format
        -i      List inode numbers
        -n      List numeric UIDs and GIDs instead of names
        -s      List allocated blocks
        -e      List full date and time
        -h      List sizes in human readable format (1K 243M 2G)
        -r      Sort in reverse order
        -S      Sort by size
        -X      Sort by extension
        -v      Sort by version
        -c      With -l: sort by ctime
        -t      With -l: sort by mtime
        -u      With -l: sort by atime
        -w N    Assume the terminal is N columns wide
        --color[={always,never,auto}]   Control coloring
    
lsof
lsof
Show all open files
lspci
lspci [-mk]
List all PCI devices
        -m      Parsable output
        -k      Show driver
    
lzma
lzma -d [-cf] [FILE]...
Decompress FILE (or stdin)
        -d      Decompress
        -c      Write to stdout
        -f      Force
    
lzop
lzop [-cfvd123456789CF] [FILE]...
        -1..9   Compression level
        -d      Decompress
        -c      Write to stdout
        -f      Force
        -v      Verbose
        -F      Don't store or verify checksum
        -C      Also write checksum of compressed block
    
md5sum
md5sum [-c[sw]] [FILE]...
Print or check MD5 checksums
        -c      Check sums against list in FILEs
        -s      Don't output anything, status code shows success
        -w      Warn about improperly formatted checksum lines
    
microcom
microcom [-d DELAY] [-t TIMEOUT] [-s SPEED] [-X] TTY
Copy bytes for stdin to TTY and from TTY to stdout
        -d      Wait up to DELAY ms for TTY output before sending every
                next byte to it
        -t      Exit if both stdin and TTY are silent for TIMEOUT ms
        -s      Set serial line to SPEED
        -X      Disable special meaning of NUL and Ctrl-X from stdin
    
mkdir
mkdir [OPTIONS] DIRECTORY...
Create DIRECTORY
        -m MODE Mode
        -p      No error if exists; make parent directories as needed
    
mkfifo
mkfifo [-m MODE] NAME
Create named pipe
        -m MODE Mode (default a=rw)
    
mktemp
mktemp [-dt] [-p DIR] [TEMPLATE]
Create a temporary file with name based on TEMPLATE and print its name. TEMPLATE must end with XXXXXX (e.g. [/dir/]nameXXXXXX). Without TEMPLATE, -t tmp.XXXXXX is assumed.
        -d      Make directory, not file
        -q      Fail silently on errors
        -t      Prepend base directory name to TEMPLATE
        -p DIR  Use DIR as a base directory (implies -t)
        -u      Do not create anything; print a name
    
Base directory is: -p DIR, else $TMPDIR, else /tmp
more
more [FILE]...
View FILE (or stdin) one screenful at a time
mpstat
mpstat [-A] [-I SUM|CPU|ALL|SCPU] [-u] [-P num|ALL] [INTERVAL [COUNT]]
Per-processor statistics
        -A                      Same as -I ALL -u -P ALL
        -I SUM|CPU|ALL|SCPU     Report interrupt statistics
        -P num|ALL              Processor to monitor
        -u                      Report CPU utilization
    
mv
mv [-fin] SOURCE DEST or: mv [-fin] SOURCE... DIRECTORY
Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY
        -f      Don't prompt before overwriting
        -i      Interactive, prompt before overwrite
        -n      Don't overwrite an existing file
    
nc
nc [IPADDR PORT]
Open a pipe to IP:PORT
nice
nice [-n ADJUST] [PROG ARGS]
Change scheduling priority, run PROG
        -n ADJUST       Adjust priority by ADJUST
    
nohup
nohup PROG ARGS
Run PROG immune to hangups, with output to a non-tty
od
od [-aBbcDdeFfHhIiLlOovXx] [FILE]
Print FILE (or stdin) unambiguously, as octal bytes by default
patch
patch [OPTIONS] [ORIGFILE [PATCHFILE]]
        -p,--strip N            Strip N leading components from file names
        -i,--input DIFF         Read DIFF instead of stdin
        -R,--reverse            Reverse patch
        -N,--forward            Ignore already applied patches
        -E,--remove-empty-files Remove output files if they become empty
    
pgrep
pgrep [-flnovx] [-s SID|-P PPID|PATTERN]
Display process(es) selected by regex PATTERN
        -l      Show command name too
        -f      Match against entire command line
        -n      Show the newest process only
        -o      Show the oldest process only
        -v      Negate the match
        -x      Match whole name (not substring)
        -s      Match session ID (0 for current)
        -P      Match parent process ID
    
pkill
pkill [-l|-SIGNAL] [-fnovx] [-s SID|-P PPID|PATTERN]
Send a signal to process(es) selected by regex PATTERN
        -l      List all signals
        -f      Match against entire command line
        -n      Signal the newest process only
        -o      Signal the oldest process only
        -v      Negate the match
        -x      Match whole name (not substring)
        -s      Match session ID (0 for current)
        -P      Match parent process ID
    
pmap
pmap [-xq] PID
Display process memory usage
        -x      Show details
        -q      Quiet
    
powertop
powertop
Analyze power consumption on Intel-based laptops
printenv
printenv [VARIABLE]...
Print environment VARIABLEs. If no VARIABLE specified, print all.
printf
printf FORMAT [ARG]...
Format and print ARG(s) according to FORMAT (a-la C printf)
ps
ps
Show list of processes
        w       Wide output
        l       Long output
        T       Show threads
    
pscan
pscan [-cb] [-p MIN_PORT] [-P MAX_PORT] [-t TIMEOUT] [-T MIN_RTT] HOST
Scan a host, print all open ports
        -c      Show closed ports too
        -b      Show blocked ports too
        -p      Scan from this port (default 1)
        -P      Scan up to this port (default 1024)
        -t      Timeout (default 5000 ms)
        -T      Minimum rtt (default 5 ms, increase for congested hosts)
    
pstree
pstree [-p] [PID|USER]
Display process tree, optionally start from USER or PID
        -p      Show pids
    
pwd
pwd
Print the full filename of the current working directory
pwdx
pwdx PID...
Show current directory for PIDs
readlink
readlink [-fnv] FILE
Display the value of a symlink
        -f      Canonicalize by following all symlinks
        -n      Don't add newline
        -v      Verbose
    
readprofile
readprofile [OPTIONS]
        -m mapfile      (Default: /boot/System.map)
        -p profile      (Default: /proc/profile)
        -M NUM          Set the profiling multiplier to NUM
        -i              Print only info about the sampling step
        -v              Verbose
        -a              Print all symbols, even if count is 0
        -b              Print individual histogram-bin counts
        -s              Print individual counters within functions
        -r              Reset all the counters (root only)
        -n              Disable byte order auto-detection
    
realpath
realpath FILE...
Return the absolute pathnames of given FILE
renice
renice [-n] PRIORITY [[-p | -g | -u] ID...]...
Change scheduling priority of a running process
        -n      Add PRIORITY to current nice value
                Without -n, nice value is set to PRIORITY
        -p      Process ids (default)
        -g      Process group ids
        -u      Process user names
    
reset
reset
Reset the screen
resize
resize
Resize the screen
rev
rev [FILE]...
Reverse lines of FILE
rm
rm [-irf] FILE...
Remove (unlink) FILEs
        -i      Always prompt before removing
        -f      Never prompt
        -R,-r   Recurse
    
rmdir
rmdir [OPTIONS] DIRECTORY...
Remove DIRECTORY if it is empty
        -p      Include parents
    
rpm
rpm -i PACKAGE.rpm; rpm -qp[ildc] PACKAGE.rpm
Manipulate RPM packages
Commands:n -i Install package -qp Query package -qpi Show information -qpl List contents -qpd List documents -qpc List config files
rpm2cpio
rpm2cpio package.rpm
Output a cpio archive of the rpm file
run-parts
run-parts [-a ARG]... [-u UMASK] [--reverse] [--test] [--exit-on-error] [--list] DIRECTORY
Run a bunch of scripts in DIRECTORY
        -a ARG          Pass ARG as argument to scripts
        -u UMASK        Set UMASK before running scripts
        --reverse       Reverse execution order
        --test          Dry run
        --exit-on-error Exit if a script exits with non-zero
        --list          Print names of matching files even if they are not executable
    
scriptreplay
scriptreplay timingfile [typescript [divisor]]
Play back typescripts, using timing information
sed
sed [-inrE] [-f FILE]... [-e CMD]... [FILE]... or: sed [-inrE] CMD [FILE]...
        -e CMD  Add CMD to sed commands to be executed
        -f FILE Add FILE contents to sed commands to be executed
        -i[SFX] Edit files in-place (otherwise sends to stdout)
                Optionally back files up, appending SFX
        -n      Suppress automatic printing of pattern space
        -r,-E   Use extended regex syntax
    
If no -e or -f, the first non-option argument is the sed command string. Remaining arguments are input files (stdin if none).
seq
seq [-w] [-s SEP] [FIRST [INC]] LAST
Print numbers from FIRST to LAST, in steps of INC. FIRST, INC default to 1.
        -w      Pad to last with leading zeros
        -s SEP  String separator
    
setsid
setsid [-c] PROG ARGS
Run PROG in a new session. PROG will have no controlling terminal and will not be affected by keyboard signals (^C etc).
        -c      Set controlling terminal to stdin
    
sh
sh [-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]
Unix shell interpreter
sha1sum
sha1sum [-c[sw]] [FILE]...
Print or check SHA1 checksums
        -c      Check sums against list in FILEs
        -s      Don't output anything, status code shows success
        -w      Warn about improperly formatted checksum lines
    
sha256sum
sha256sum [-c[sw]] [FILE]...
Print or check SHA256 checksums
        -c      Check sums against list in FILEs
        -s      Don't output anything, status code shows success
        -w      Warn about improperly formatted checksum lines
    
sha3sum
sha3sum [-c[sw]] [-a BITS] [FILE]...
Print or check SHA3 checksums
        -c      Check sums against list in FILEs
        -s      Don't output anything, status code shows success
        -w      Warn about improperly formatted checksum lines
        -a BITS 224 (default), 256, 384, 512
    
sha512sum
sha512sum [-c[sw]] [FILE]...
Print or check SHA512 checksums
        -c      Check sums against list in FILEs
        -s      Don't output anything, status code shows success
        -w      Warn about improperly formatted checksum lines
    
shuf
shuf [-e|-i L-H] [-n NUM] [-o FILE] [-z] [FILE|ARG...]
Randomly permute lines
        -e      Treat ARGs as lines
        -i L-H  Treat numbers L-H as lines
        -n NUM  Output at most NUM lines
        -o FILE Write to FILE, not standard output
        -z      End lines with zero byte, not newline
    
sleep
sleep [N]...
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
smemcap
smemcap >SMEMDATA.TAR
Collect memory usage data in /proc and write it to stdout
sort
sort [-nrugMcszbdfiokt] [-o FILE] [-k start[.offset][opts][,end[.offset][opts]] [-t CHAR] [FILE]...
Sort lines of text
        -o FILE Output to FILE
        -c      Check whether input is sorted
        -b      Ignore leading blanks
        -f      Ignore case
        -i      Ignore unprintable characters
        -d      Dictionary order (blank or alphanumeric only)
        -g      General numerical sort
        -M      Sort month
        -n      Sort numbers
        -t CHAR Field separator
        -k N[,M] Sort by Nth field
        -r      Reverse sort order
        -s      Stable (don't sort ties alphabetically)
        -u      Suppress duplicate lines
        -z      Lines are terminated by NUL, not newline
    
split
split [OPTIONS] [INPUT [PREFIX]]
        -b N[k|m]       Split by N (kilo|mega)bytes
        -l N            Split by N lines
        -a N            Use N letters as suffix
    
strings
strings [-fo] [-t o/d/x] [-n LEN] [FILE]...
Display printable strings in a binary file
        -f              Precede strings with filenames
        -o              Precede strings with octal offsets
        -t o/d/x        Precede strings with offsets in base 8/10/16
        -n LEN          At least LEN characters form a string (default 4)
    
sum
sum [-rs] [FILE]...
Checksum and count the blocks in a file
        -r      Use BSD sum algorithm (1K blocks)
        -s      Use System V sum algorithm (512byte blocks)
    
sync
sync
Write all buffered blocks to disk
sysctl
sysctl [OPTIONS] [KEY[=VALUE]]...
Show/set kernel parameters
        -e      Don't warn about unknown keys
        -n      Don't show key names
        -a      Show all values
        -w      Set values
        -p FILE Set values from FILE (default /etc/sysctl.conf)
        -q      Set values silently
    
syslogd
syslogd [OPTIONS]
System logging utility
        -n              Run in foreground
        -R HOST[:PORT]  Log to HOST:PORT (default PORT:514)
        -L              Log locally and via network (default is network only if -R)
        -C[size_kb]     Log to shared mem buffer (use logread to read it)
        -K              Log to kernel printk buffer (use dmesg to read it)
        -O FILE         Log to FILE (default: /var/log/messages, stdout if -)
        -s SIZE         Max size (KB) before rotation (default:200KB, 0=off)
        -b N            N rotated logs to keep (default:1, max=99, 0=purge)
        -l N            Log only messages more urgent than prio N (1-8)
        -S              Smaller output
        -f FILE         Use FILE as config (default:/etc/syslog.conf)
    
tail
tail [OPTIONS] [FILE]...
Print last 10 lines of each FILE (or stdin) to stdout. With more than one FILE, precede each with a filename header.
        -f              Print data as file grows
        -c [+]N[kbm]    Print last N bytes
        -n N[kbm]       Print last N lines
        -n +N[kbm]      Start on Nth line and print the rest
        -q              Never print headers
        -s SECONDS      Wait SECONDS between reads with -f
        -v              Always print headers
        -F              Same as -f, but keep retrying
    
N may be suffixed by k (x1024), b (x512), or m (x1024^2).
tar
tar -[cxtZzJjahmvO] [-X FILE] [-T FILE] [-f TARFILE] [-C DIR] [FILE]...
Create, extract, or list files from a tar file
Operation:n c Create x Extract t List f Name of TARFILE ('-' for stdin/out) C Change to DIR before operation v Verbose Z (De)compress using compress z (De)compress using gzip J (De)compress using xz j (De)compress using bzip2 a (De)compress using lzma O Extract to stdout h Follow symlinks m Don't restore mtime exclude File to exclude X File with names to exclude T File with names to include
tee
tee [-ai] [FILE]...
Copy stdin to each FILE, and also to stdout
        -a      Append to the given FILEs, don't overwrite
        -i      Ignore interrupt signals (SIGINT)
    
telnet
telnet [-a] [-l USER] HOST [PORT]
Connect to telnet server
        -a      Automatic login with $USER variable
        -l USER Automatic login as USER
    
telnetd
telnetd [OPTIONS]
Handle incoming telnet connections
        -l LOGIN        Exec LOGIN on connect
        -f ISSUE_FILE   Display ISSUE_FILE instead of /etc/issue
        -K              Close connection as soon as login exits
                        (normally wait until all programs close slave pty)
        -p PORT         Port to listen on
        -b ADDR[:PORT]  Address to bind to
        -F              Run in foreground
        -i              Inetd mode
        -w SEC          Inetd 'wait' mode, linger time SEC
        -S              Log to syslog (implied by -i or without -F and -w)
    
tftp
tftp [OPTIONS] HOST [PORT]
Transfer a file from/to tftp server
        -l FILE Local FILE
        -r FILE Remote FILE
        -g      Get file
        -p      Put file
        -b SIZE Transfer blocks of SIZE octets
    
tftpd
tftpd [-cr] [-u USER] [DIR]
Transfer a file on tftp client's request
tftpd should be used as an inetd service. tftpd's line for inetd.conf: 69 dgram udp nowait root tftpd tftpd -l /files/to/serve It also can be ran from udpsvd:n udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve
        -r      Prohibit upload
        -c      Allow file creation via upload
        -u      Access files as USER
        -l      Log to syslog (inetd mode requires this)
    
timeout
timeout [-t SECS] [-s SIG] PROG ARGS
Runs PROG. Sends SIG to it if it is not gone in SECS seconds. Defaults: SECS: 10, SIG: TERM.
touch
touch [-c] [-d DATE] [-t DATE] [-r FILE] FILE...
Update the last-modified date on the given FILE[s]
        -c      Don't create files
        -h      Don't follow links
        -d DT   Date/time to use
        -t DT   Date/time to use
        -r FILE Use FILE's date/time
    
tr
tr [-cds] STRING1 [STRING2]
Translate, squeeze, or delete characters from stdin, writing to stdout
        -c      Take complement of STRING1
        -d      Delete input characters coded STRING1
        -s      Squeeze multiple output characters of STRING2 into one character
    
truncate
truncate [-c] -s SIZE FILE...
Truncate FILEs to the given size
        -c      Do not create files
        -s SIZE Truncate to SIZE
    
tty
tty
Print file name of stdin's terminal
        -s      Print nothing, only return exit status
    
ttysize
ttysize [w] [h]
Print dimension(s) of stdin's terminal, on error return 80x25
uname
uname [-amnrspvio]
Print system information
        -a      Print all
        -m      The machine (hardware) type
        -n      Hostname
        -r      Kernel release
        -s      Kernel name (default)
        -p      Processor type
        -v      Kernel version
        -i      The hardware platform
        -o      OS name
    
uncompress
uncompress [-cf] [FILE]...
Decompress .Z file[s]
        -c      Write to stdout
        -f      Overwrite
    
unexpand
unexpand [-fa][-t N] [FILE]...
Convert spaces to tabs, writing to stdout
        -a,--all        Convert all blanks
        -f,--first-only Convert only leading blanks
        -t,--tabs=N     Tabstops every N chars
    
uniq
uniq [-cdu][-f,s,w N] [INPUT [OUTPUT]]
Discard duplicate lines
        -c      Prefix lines by the number of occurrences
        -d      Only print duplicate lines
        -u      Only print unique lines
        -f N    Skip first N fields
        -s N    Skip first N chars (after any skipped fields)
        -w N    Compare N characters in line
    
unix2dos
unix2dos [-ud] [FILE]
Convert FILE in-place from Unix to DOS format. When no file is given, use stdin/stdout.
        -u      dos2unix
        -d      unix2dos
    
unlink
unlink FILE
Delete FILE by calling unlink()
unlzma
unlzma [-cf] [FILE]...
Decompress FILE (or stdin)
        -c      Write to stdout
        -f      Force
    
unxz
unxz [-cf] [FILE]...
Decompress FILE (or stdin)
        -c      Write to stdout
        -f      Force
    
unzip
unzip [-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]
Extract FILEs from ZIP archive
        -l      List contents (with -q for short form)
        -n      Never overwrite files (default: ask)
        -o      Overwrite
        -p      Print to stdout
        -q      Quiet
        -x FILE Exclude FILEs
        -d DIR  Extract into DIR
    
usleep
usleep N
Pause for N microseconds
uudecode
uudecode [-o OUTFILE] [INFILE]
Uudecode a file Finds OUTFILE in uuencoded source unless -o is given
uuencode
uuencode [-m] [FILE] STORED_FILENAME
Uuencode FILE (or stdin) to stdout
        -m      Use base64 encoding per RFC1521
    
vi
vi [OPTIONS] [FILE]...
Edit FILE
        -c CMD  Initial command to run ($EXINIT also available)
        -R      Read-only
        -H      List available features
    
volname
volname [DEVICE]
Show CD volume name of the DEVICE (default /dev/cdrom)
watch
watch [-n SEC] [-t] PROG ARGS
Run PROG periodically
        -n      Loop period in seconds (default 2)
        -t      Don't print header
    
wc
wc [-cmlwL] [FILE]...
Count lines, words, and bytes for each FILE (or stdin)
        -c      Count bytes
        -m      Count characters
        -l      Count newlines
        -w      Count words
        -L      Print longest line length
    
wget
wget [-c|--continue] [--spider] [-q|--quiet] [-O|--output-document FILE] [--header 'header: value'] [-Y|--proxy on/off] [-P DIR] [-U|--user-agent AGENT] [-T SEC] URL...
Retrieve files via HTTP or FTP
        --spider        Spider mode - only check file existence
        -c              Continue retrieval of aborted transfer
        -q              Quiet
        -P DIR          Save to DIR (default .)
        -T SEC          Network read timeout is SEC seconds
        -O FILE         Save to FILE ('-' for stdout)
        -U STR          Use STR for User-Agent header
        -Y on/off       Use proxy
    
which
which [COMMAND]...
Locate a COMMAND
whoami
whoami
Print the user name associated with the current effective user id
xargs
xargs [OPTIONS] [PROG ARGS]
Run PROG on every item given by stdin
        -p      Ask user whether to run each command
        -r      Don't run command if input is empty
        -0      Input is separated by NUL characters
        -t      Print the command on stderr before execution
        -e[STR] STR stops input processing
        -n N    Pass no more than N args to PROG
        -s N    Pass command line of no more than N bytes
        -I STR  Replace STR within PROG ARGS with input line
        -x      Exit if size is exceeded
    
xz
xz -d [-cf] [FILE]...
Decompress FILE (or stdin)
        -d      Decompress
        -c      Write to stdout
        -f      Force
    
yes
yes [STRING]
Repeatedly output a line with STRING, or 'y'

GNU Libc (glibc) 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. This is implemented using an /etc/nsswitch.conf configuration file, and using one or more of the /lib/libnss_* libraries. BusyBox tries to avoid using any libc calls that make use of NSS. Some applets however, such as login and su, will use libc functions that require NSS.
If you enable CONFIG_USE_BB_PWD_GRP, BusyBox will use internal functions to directly access the /etc/passwd, /etc/group, and /etc/shadow files without using NSS. This may allow you to run your system without the need for installing any of the NSS configuration files and libraries.
When used with glibc, the BusyBox 'networking' applets will similarly require that you install at least some of the glibc NSS stuff (in particular, /etc/nsswitch.conf, /lib/libnss_dns*, /lib/libnss_files*, and /lib/libresolv*).
Shameless Plug: As an alternative, one could use a C library such as uClibc. In addition to making your system significantly smaller, uClibc does not require the use of any NSS support files or libraries.

Denis Vlasenko <vda.linux@googlemail.com>

The following people have contributed code to BusyBox whether they know it or not. If you have written code included in BusyBox, you should probably be listed here so you can obtain your bit of eternal glory. If you should be listed here, or the description of what you have done needs more detail, or is incorrect, please send in an update.
Emanuele Aina <emanuele.aina@tiscali.it>
run-parts
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.
    Lots of tedious effort writing these boring docs that
    nobody is going to actually read.
Laurence Anderson <l.d.anderson@warwick.ac.uk>
    rpm2cpio, unzip, get_header_cpio, read_gz interface, rpm
Jeff Angielski <jeff@theptrgroup.com>
    ftpput, ftpget
Edward Betts <edward@debian.org>
    expr, hostid, logname, whoami
John Beppu <beppu@codepoet.org>
    du, nslookup, sort
Brian Candler <B.Candler@pobox.com>
    tiny-ls(ls)
Randolph Chung <tausq@debian.org>
    fbset, ping, hostname
Dave Cinege <dcinege@psychosis.com>
    more(v2), makedevs, dutmp, modularization, auto links file,
    various fixes, Linux Router Project maintenance
Jordan Crouse <jordan@cosmicpenguin.net>
    ipcalc
Magnus Damm <damm@opensource.se>
    tftp client insmod powerpc support
Larry Doolittle <ldoolitt@recycle.lbl.gov>
    pristine source directory compilation, lots of patches and fixes.
Glenn Engel <glenne@engel.org>
    httpd
Gennady Feldman <gfeldman@gena01.com>
    Sysklogd (single threaded syslogd, IPC Circular buffer support,
    logread), various fixes.
Karl M. Hegbloom <karlheg@debian.org>
    cp_mv.c, the test suite, various fixes to utility.c, &c.
Daniel Jacobowitz <dan@debian.org>
    mktemp.c
Matt Kraai <kraai@alumni.cmu.edu>
    documentation, bugfixes, test suite
Stephan Linz <linz@li-pro.net>
    ipcalc, Red Hat equivalence
John Lombardo <john@deltanet.com>
    tr
Glenn McGrath <bug1@iinet.net.au>
    Common unarchiving code and unarchiving applets, ifupdown, ftpgetput,
    nameif, sed, patch, fold, install, uudecode.
    Various bugfixes, review and apply numerous patches.
Manuel Novoa III <mjn3@codepoet.org>
    cat, head, mkfifo, mknod, rmdir, sleep, tee, tty, uniq, usleep, wc, yes,
    mesg, vconfig, make_directory, parse_mode, dirname, mode_string,
    get_last_path_component, simplify_path, and a number trivial libbb routines
    also bug fixes, partial rewrites, and size optimizations in
    ash, basename, cal, cmp, cp, df, du, echo, env, ln, logname, md5sum, mkdir,
    mv, realpath, rm, sort, tail, touch, uname, watch, arith, human_readable,
    interface, dutmp, ifconfig, route
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 in 1995, 1996. Some of his code can
    still be found hiding here and there...
Tim Riker <Tim@Rikers.org>
    bug fixes, member of fan club
Kent Robotti <robotti@metconnect.com>
    reset, tons and tons of bug reports and patches.
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>
    grep, sed, cut, xargs(previous),
    style-guide, new-applet-HOWTO, bug fixes, etc.
Charles P. Wright <cpwright@villagenet.com>
    gzip, mini-netcat(nc)
Enrique Zanardi <ezanardi@ull.es>
    tarcat (since removed), loadkmap, various fixes, Debian maintenance
Tito Ragusa <farmatito@tiscali.it>
    devfsd and size optimizations in strings, openvt and deallocvt.
Paul Fox <pgf@foxharp.boston.ma.us>
    vi editing mode for ash, various other patches/fixes
Roberto A. Foglietta <me@roberto.foglietta.name>
    port: dnsd
Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
    misc
Mike Frysinger <vapier@gentoo.org>
    initial e2fsprogs, printenv, setarch, sum, misc
Jie Zhang <jie.zhang@analog.com>
    fixed two bugs in msh and hush (exitcode of killed processes)
2018-12-21 version 1.26.2

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