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-Erik
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Erik Andersen
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docs/busybox.pod
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docs/busybox.pod
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=head1 NAME
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busybox - I am BusyBox of Borg. Unix will be assimilated.
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BusyBox - The Swiss Army Knife of Embedded Linux
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=head1 SYNOPSIS
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=head1 SYNTAX
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busybox <function> [arguments...] # or
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BusyBox <function> [arguments...] # or
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<function> [arguments...] # if symlinked
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=head1 DESCRIPTION
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BusyBox is a multi-call binary that combines many common Unix utilities into a
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single executable. Most people will create a link to busybox for each function
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they wish to use, and BusyBox will act like whatever it was invoked as. For
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example,
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BusyBox combines tiny versions of many common UNIX utilities into a single
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small executable. It provides minimalist replacements for most of the utilities
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you usually find in fileutils, shellutils, findutils, textutils, grep, gzip,
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tar, etc. BusyBox provides a fairly complete POSIX environment for any small
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or emdedded system. While the number of options for the utilities BusyBox
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provides have generally been reduced, the provided options behave very much
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like they do in their full featured GNU cousins.
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ln -s ./busybox ls
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BusyBox has been written with size-optimization and limited resources in mind.
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It is also extremely modular so you can easily include or exclude commands (or
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features) at compile time. This makes it easy to customize your embedded
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systems. To create a working system, just add a kernel, a shell (such as ash),
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and an editor (such as elvis-tiny or ae).
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=head1 USAGE
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When you create a link to BusyBox for the function you wish to use, when BusyBox
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is called using that link it will behave as if the command itself has been invoked.
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For example, entering
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ln -s ./BusyBox ls
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./ls
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will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled
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into busybox). You can also invoke BusyBox by providing it the command to run
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on the command line. For example,
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into BusyBox).
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./busybox ls
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You can also invoke BusyBox by issuing the command as an argument on the
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command line. For example, entering
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./BusyBox ls
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will also cause BusyBox to behave as 'ls'.
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BusyBox has been written with size-optimization in mind. It is very easy to
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include or exclude the commands (or features) you want installed. BusyBox
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tries to make itself useful to small systems with limited resources.
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=head1 COMMON OPTIONS
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Most BusyBox commands support the B<--help> option to provide a
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@ -57,7 +71,7 @@ uptime, usleep, wc, whoami, yes, zcat, [
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Usage: basename [file ...]
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Strips directory and suffix from filenames.
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Strips directory path and suffixes from FILE(s).
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Example:
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@ -70,9 +84,9 @@ Example:
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=item cat
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Usage: cat [file ...]
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Usage: cat [FILE ...]
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Concatenates files and prints them to the standard output.
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Concatenates FILE(s) and prints them to the standard output.
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Example:
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@ -105,48 +119,48 @@ Example:
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Usage: chmod [B<-R>] MODE[,MODE]... FILE...
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Changes file access permissions for the specified file(s) or directory(s).
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Changes file access permissions for the specified FILE(s) (or directories).
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Each MODE is defined by combining the letters for WHO has access to the file,
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an OPERATOR for selecting how the permissions should be changed, and a
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PERISSION for the file(s) or directory(s).
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PERISSION for FILE(s) (or directories).
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WHO may be chosen from:
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WHO may be chosen from
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u the User who owns the file
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g users in the file's Group
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u User who owns the file
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g Users in the file's Group
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o Other users not in the file's group
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a All users
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OPERATOR may be chosen from:
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OPERATOR may be chosen from
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+ add a permission
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- remove a permission
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= assign a permission
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+ Add a permission
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- Remove a permission
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= Assign a permission
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PERMISSION may be chosen from:
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PERMISSION may be chosen from
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r Read
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w Write
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x eXecute (or access for directories)
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x Execute (or access for directories)
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s Set user (or group) ID bit
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t sTickey bit (for directories prevents removing files by non-owners)
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t Stickey bit (for directories prevents removing files by non-owners)
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Alternately, permissions may be set numerically where the first three
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numbers are calculated by adding the octal values:
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Alternately, permissions can be set numerically where the first three
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numbers are calculated by adding the octal values, such as
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4 Read
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2 Write
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1 eXecute
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1 Execute
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An optional fourth digit may also be used to specify
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An optional fourth digit can also be used to specify
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4 Set user ID
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2 Set group ID
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1 sTickey bit
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1 Stickey bit
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Options:
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-R change files and directories recursively.
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-R Change files and directories recursively.
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Example:
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@ -163,13 +177,13 @@ Example:
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=item chown
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Usage: chown [OPTION]... OWNER[.[GROUP] FILE...
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Usage: chown [OPTION]... OWNER[<.|:>[GROUP] FILE...
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Changes the owner and/or group of each FILE to OWNER and/or GROUP.
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Options:
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-R change files and directories recursively
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-R Changes files and directories recursively
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Example:
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@ -193,7 +207,7 @@ Run COMMAND with root directory set to NEWROOT.
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Example:
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$ ls -l /bin/ls
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lrwxrwxrwx 1 root root 12 Apr 13 00:46 /bin/ls -> /busybox
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lrwxrwxrwx 1 root root 12 Apr 13 00:46 /bin/ls -> /BusyBox
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$ mount /dev/hdc1 /mnt -t minix
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$ chroot /mnt
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$ ls -l /bin/ls
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@ -211,7 +225,7 @@ Clears the screen.
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Usage: chvt N
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Change foreground virtual terminal to /dev/ttyN
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Changes the foreground virtual terminal to /dev/ttyN
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-------------------------------
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@ -221,12 +235,12 @@ Usage: cp [OPTION]... SOURCE DEST
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or: cp [OPTION]... SOURCE... DIRECTORY
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Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
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Copies SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
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-a same as -dpR
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-d preserve links
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-p preserve file attributes if possable
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-R copy directories recursively
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-a Same as -dpR
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-d Preserves links
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-p Preserves file attributes if possable
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-R Copies directories recursively
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-------------------------------
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@ -236,13 +250,12 @@ Usage: date [OPTION]... [+FORMAT]
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or: date [OPTION] [MMDDhhmm[[CC]YY][.ss]]
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Display the current time in the given FORMAT, or set the system date.
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Displays the current time in the given FORMAT, or sets the system date.
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Options:
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-R output RFC-822 compliant date string
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-s set time described by STRING
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-u print or set Coordinated Universal Time
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-R Outputs RFC-822 compliant date string
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-s Sets time described by STRING
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-u Prints or sets Coordinated Universal Time
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Example:
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@ -329,7 +342,7 @@ Options:
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Example:
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$ ./busybox du
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$ ./BusyBox du
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16 ./CVS
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12 ./kernel-patches/CVS
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80 ./kernel-patches
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@ -554,11 +567,11 @@ Options:
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Example:
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$ ls -la /tmp/busybox*
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-rw-rw-r-- 1 andersen andersen 557009 Apr 11 10:55 /tmp/busybox-0.43.tar.gz
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$ gunzip /tmp/busybox-0.43.tar.gz
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$ ls -la /tmp/busybox*
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-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/busybox-0.43.tar
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$ ls -la /tmp/BusyBox*
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-rw-rw-r-- 1 andersen andersen 557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz
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$ gunzip /tmp/BusyBox-0.43.tar.gz
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$ ls -la /tmp/BusyBox*
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-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar
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-------------------------------
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@ -575,11 +588,11 @@ Options:
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Example:
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$ ls -la /tmp/busybox*
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-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/busybox-0.43.tar
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$ gzip /tmp/busybox-0.43.tar
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$ ls -la /tmp/busybox*
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-rw-rw-r-- 1 andersen andersen 554058 Apr 14 17:49 /tmp/busybox-0.43.tar.gz
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$ ls -la /tmp/BusyBox*
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-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar
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$ gzip /tmp/BusyBox-0.43.tar
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$ ls -la /tmp/BusyBox*
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-rw-rw-r-- 1 andersen andersen 554058 Apr 14 17:49 /tmp/BusyBox-0.43.tar.gz
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-------------------------------
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@ -799,9 +812,9 @@ Options:
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Example:
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$ ln -s busybox /tmp/ls
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[andersen@debian busybox]$ ls -l /tmp/ls
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lrwxrwxrwx 1 root root 7 Apr 12 18:39 ls -> busybox*
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$ ln -s BusyBox /tmp/ls
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[andersen@debian BusyBox]$ ls -l /tmp/ls
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lrwxrwxrwx 1 root root 7 Apr 12 18:39 ls -> BusyBox*
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-------------------------------
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@ -1803,4 +1816,4 @@ Enrique Zanardi <ezanardi@ull.es>
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=cut
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# $Id: busybox.pod,v 1.19 2000/04/19 05:15:12 erik Exp $
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# $Id: busybox.pod,v 1.20 2000/04/21 01:23:36 erik Exp $
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