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| -rw-r--r-- | docs/busybox.pod | 361 |
1 files changed, 294 insertions, 67 deletions
diff --git a/docs/busybox.pod b/docs/busybox.pod index 8d8e198c5..655e07bca 100644 --- a/docs/busybox.pod +++ b/docs/busybox.pod @@ -11,53 +11,151 @@ busybox - I am BusyBox of Borg. Unix will be assimilated. =head1 DESCRIPTION BusyBox is a multi-call binary that combines many common Unix utilities into a -single executable. Most people will create a symlink to busybox for each -function name, and BusyBox will act like whatever you invoke it as. +single executable. Most people will create a link to busybox for each function +they wish to use, and BusyBox will act like whatever it was invoked as. For +example, + + 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 providing it the command to run +on the command line. For example, + + ./busybox ls + +will also cause BusyBox to behave as 'ls'. BusyBox has been written with size-optimization in mind. It is very easy to -include or exclude the commands you want installed. BusyBox tries to make -itself useful to small systems with limited resources. +include or exclude the commands (or features) you want installed. BusyBox +tries to make itself useful to small systems with limited resources. =head1 COMMANDS -Currently defined functions: -busybox, cat, chmod, chown, chgrp, chroot, clear, chvt, cp, date, -dd, df, dmesg, du, fbset, find, free, deallocvt, fsck.minix, mkfs.minix, -grep, head, hostname, init, linuxrc, kill, ln, ls, lsmod, mkdir, -mknod, mkswap, more, mount, mv, ping, poweroff, ps, pwd, reboot, -rm, rmdir, sed, sleep, sort, sync, syslogd, swapon, swapoff, tail, -tar, tee, touch, true, false, uname, umount, uniq, update, zcat, -gunzip, gzip +Currently defined functions include: + + basename, cat, chmod, chown, chgrp, chroot, clear, chvt, cp, mv, date, + dd, df, dirname, dmesg, du, dutmp, echo, fbset, fdflush, find, free, + freeramdisk, deallocvt, fsck.minix, mkfs.minix, grep, gunzip, gzip, + halt, head, hostid, hostname, init, kill, killall, length, ln, loadacm, + loadfont, loadkmap, ls, lsmod, makedevs, math, mkdir, mkfifo, mknod, + mkswap, mnc, more, mount, mt, nslookup, poweroff, ping, printf, ps, + pwd, reboot, rm, rmdir, rmmod, sed, sh, fdisk, sfdisk, sleep, sort, + sync, syslogd, logger, logname, swapon, swapoff, tail, tar, [, test, + tee, touch, tr, true, false, tty, umount, uname, uptime, uniq, update, + usleep, wc, whoami, yes, zcat + +=head1 OPTIONS + +Common Options: + + Most BusyBox commands support the "--help" option to provide a + terse runtime description of their behavior. =over 4 +=item basename + +Usage: basename [file ...] + +Strips directory and suffix from filenames. + +Example: + + $ basename /usr/local/bin/foo + foo + $ basename /usr/local/bin/ + bin + =item cat Usage: cat [file ...] - + +Concatenates files and prints them to the standard output. + +Example: + + $ cat /proc/uptime + 110716.72 17.67 =item chmod Usage: 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. - +Changes file access permissions for the specified file(s) or directory(s). +Each MODE is defined by combining the letters for WHO has access to the file, +an OPERATOR for selecting how the permissions should be changed, and a +PERISSION for the file(s) or directory(s). + +WHO may be chosen from: + + u the User who owns the file + g users in the file's Group + o Other users not in the file's group + a All users + +OPERATOR may be chosen from: + + + add a permission + - remove a permission + = assign a permission + +PERMISSION may be chosen from: + + r Read + w Write + x eXecute (or access for directories) + s Set user (or group) ID bit + t sTickey bit (for directories prevents removing files by non-owners) + +Alternately, permissions may be set numerically where the first three +numbers are calculated by adding the octal values: + + 4 Read + 2 Write + 1 eXecute + +An optional fourth digit may also be used to specify + + 4 Set user ID + 2 Set group ID + 1 sTickey bit + Options: -R change 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 =item chown Usage: chown [OPTION]... OWNER[.[GROUP] FILE... -Change the owner and/or group of each FILE to OWNER and/or GROUP. +Changes the owner and/or group of each FILE to OWNER and/or GROUP. Options: -R change files and directories recursively - + +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 =item chgrp @@ -69,6 +167,13 @@ Options: -R change 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 =item chroot @@ -76,10 +181,18 @@ Usage: chroot NEWROOT [COMMAND...] Run COMMAND with root directory set to NEWROOT. +Exmaple: -=item clear + $ ls -l /bin/ls + lrwxrwxrwx 1 root root 12 Apr 13 00:46 /bin/ls -> /bin/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* +=item clear +Clears the screen. =item chvt @@ -92,53 +205,109 @@ Change foreground virtual terminal to /dev/ttyN Usage: cp [OPTION]... SOURCE DEST -or: cp [OPTION]... SOURCE... DIRECTORY + or: cp [OPTION]... SOURCE... DIRECTORY Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY. - -a same as -dpR - -d preserve links - -p preserve file attributes if possible - -R copy directories recursively - + -a same as -dpR + -d preserve links + -p preserve file attributes if possable + -R copy directories recursively =item date +Usage: date [OPTION]... [+FORMAT] + + or: date [OPTION] [MMDDhhmm[[CC]YY][.ss]] +Display the current time in the given FORMAT, or set the system date. + +Options: + -R output RFC-822 compliant date string + -s set time described by STRING + -u print or set Coordinated Universal Time + +Example: + + $ date + Wed Apr 12 18:52:41 MDT 2000 =item dd -Usage: dd [if=name] [of=name] [bs=n] [count=n] +Usage: dd [if=name] [of=name] [bs=n] [count=n] [skip=n] [seek=n] Copy a file, converting and formatting according to options - if=FILE read from FILE instead of stdin - of=FILE write to FILE instead of stout - bs=n read and write N BYTES at a time - count=n copy only n input blocks - BYTES may be suffixed by w (x2), k (x1024), b (x512), or m (x1024^2). + 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 + +Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2) +Example: + + $ dd if=/dev/zero of=/dev/ram1 bs=1M count=4 + 4+0 records in + 4+0 records out + =item df -Usage: df +Usage: df [filesystem ...] + +Prints the filesystem space used and space available. + +Exmaple: + + $ 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% / =item dmesg Usage: dmesg [-c] [-n level] [-s bufsize] +Print or controls the kernel ring buffer. =item du -Usage: Usage: du [OPTION]... [FILE]... +Usage: du [OPTION]... [FILE]... - -s display only a total for each argument - +Summarize disk space used for each FILE and/or directory. +Disk space is printed in units of 1k (i.e. 1024 bytes). + +Options: + -l count sizes many times if hard linked + -s display only a total for each argument + +Example: + + $ ./busybox 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 . + =item fbset Usage: fbset [options] [mode] +Show and modify frame buffer device settings + Options: -h @@ -162,25 +331,40 @@ Usage: find [PATH...] [EXPRESSION] 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 (with leading directories removed) matches PATTERN. + -print + print the full file name followed by a newline to stdout. + +Example: - -follow - Dereference symbolic links. - -name PATTERN - File name (with leading directories removed) matches PATTERN. - -print - print the full file name followed by a newline to stdout. - This version of find matches full regular expresions. + $ find / -name /etc/passwd + /etc/passwd =item free Usage: free +Displays the amount of free and used memory in the system. + +Example: + + $ free + total used free shared buffers + Mem: 257628 248724 8904 59644 93124 + Swap: 128516 8404 120112 + Total: 386144 257128 129016 + + =item deallocvt Usage: deallocvt N -Deallocate unused virtual terminal /dev/ttyN +Deallocates unused virtual terminal /dev/ttyN =item fsck.minix @@ -189,15 +373,14 @@ Usage: fsck.minix [-larvsmf] /dev/name 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. +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. =item mkfs.minix @@ -206,27 +389,52 @@ Usage: mkfs.minix [-c | -l filename] [-nXX] [-iXX] /dev/name [blocks] Make a MINIX filesystem. -Options: - - -c Check the device for bad blocks - -n [14|30] Specify the maximum length of filenames - -i Specify the number of inodes for the filesystem - -l FILENAME Read the bad blocks list from FILENAME - -v Make a Minix version 2 filesystem +OPTIONS: + -c Check the device for bad blocks + -n [14|30] Specify the maximum length of filenames + -i Specify the number of inodes for the filesystem + -l FILENAME Read the bad blocks list from FILENAME + -v Make a Minix version 2 filesystem =item grep +Usage: grep [OPTIONS]... PATTERN [FILE]... + +Search for PATTERN in each FILE or standard input. + +OPTIONS: + -h suppress the prefixing filename on output + -i ignore case distinctions + -n print line number with output lines + -q be quiet. Returns 0 if result was found, 1 otherwise + +This version of grep matches full regular expresions. +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 + =item head -Usage: Usage: head [FILE]... +Usage: head [OPTION] [FILE]... 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 + +Example: + + $ head -n 2 /etc/passwd + root:x:0:0:root:/root:/bin/bash + daemon:x:1:1:daemon:/usr/sbin:/bin/sh =item hostname @@ -234,18 +442,37 @@ Usage: hostname [OPTION] {hostname | -F file} Get or set the hostname or DNS domain name. If a hostname is given (or a file with the -F parameter), the host name will be set. - + Options: + -s Short + -i Addresses for the hostname + -d DNS domain name + -F FILE Use the contents of FILE to specify the hostname - -s Short - -i Addresses for the hostname - -d DNS domain name - -F FILE Use the contents of FILE to specify the hostname - +Example: + + $ hostname + slag =item kill +Usage: kill [-signal] process-id [process-id ...] +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 =item ln |