GNU Core Utilities

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The GNU Core Utilities or coreutils is a package of GNU software containing many of the basic tools such as cat, ls, and rm needed for Unix-like operating systems. It is a combination of a number of earlier packages, including textutils, shellutils, and fileutils along with some other miscellaneous utilities.

Contents 1 GNU coreutils capabilities 2 Programs included in coreutils 3 See also 4 External link

[edit] GNU coreutils capabilities

The GNU core utilities support long options as parameters to the commands, as well as (unless the POSIXLY_CORRECT environment variable is set) the relaxed convention allowing options even after the regular arguments. Note that this environment variable enables a different functionality in BSD.

Additionally, as the GNU philosophy shifts information away from manual pages (and uses tools such as info), usage information is more extensive.

[edit] Programs included in coreutils

The Debian package coreutils 5.2.1-2 contains these programs:

File Utilities

• chgrp Changes file group ownership.
• chown Changes file ownership.
• chmod changes the permissions of a file or folder
• cp copies a file or folder
• dd Copies and converts a file.
• df Shows disk free space on filesystems.
• dir functions exactly the same as ls
• dircolors color setup for ls
• install copy files and set attributes
• ln Create a link to a file.
• ls lists the files in a directory
• mkdir creates a directory
• mkfifo make FIFOs (named pipes)
• mknod make block or character special files
• mv Moves files.
• rm Removes (deletes) files.
• rmdir Removes empty directories.
• shred overwrite a file to hide its contents, and optionally delete it
• sync flush file system buffers
• touch Changes file timestamps.
• vdir list directory contents

Text utilities

• cat concatenates and prints files on the standard output
• cksum checksum and count the bytes in a file
• comm compares two sorted files line by line
• csplit split a file into sections determined by context lines
• cut remove sections from each line of files
• expand convert tabs to spaces
• fmt simple optimal text formatter
• fold wrap each input line to fit in specified width
• head output the first part of files
• join join lines of two files on a common field
• md5sum compute and check MD5 message digest
• nl number lines of files
• od dump files in octal and other formats
• paste merge lines of files
• ptx produce a permuted index of file contents
• pr convert text files for printing
• sha1sum compute and check SHA1 message digest
• sort sort lines of text files
• split split a file into pieces
• sum checksum and count the blocks in a file
• tac concatenate and print files in reverse
• tail outputs the last part of files
• tr translates or deletes characters
• tsort perform topological sort
• unexpand convert spaces to tabs
• uniq remove duplicate lines from a sorted file
• wc prints the number of bytes, words, and lines in files

Shell utilities

• basename Removes the path prefix from a given pathname.
• chroot Changes the root directory.
• date Prints/sets the system date and time.
• dirname strip non-directory suffix from file name
• du Shows disk usage on filesystems.
• echo display a line of text
• env Displays/modifies the environment.
• expr evaluate expressions
• factor factor numbers
• false do nothing, unsuccessfully
• groups print the groups a user is in
• hostid print the numeric identifier for the current host
• id Print real/effective uid/gid.
• link call the link function to create a link to a file
• logname print user's login name
• nice Modify scheduling priority.
• nohup Allows a command to continue running after logging out.
• pathchk check whether file names are valid or portable
• pinky lightweight finger
• printenv print all or part of environment
• printf format and print data
• pwd Print the current working directory.
• readlink display value of a symbolic link
• seq print a sequence of numbers
• sleep delay for a specified amount of time
• stat returns useful data about an inode.
• stty change and print terminal line settings
• tee Sends output to multiple files.
• test Evaluates an expression.
• true do nothing, successfully
• tty Print terminal name.
• uname Print system information.
• unlink call the unlink function to remove the specified file
• users print the user names of users currently logged in to the current host
• who Print a list of all users currently logged in.
• whoami print effective userid
• yes Print a string repeatedly.

In addition, coreutils contains a program called [. It is a synonym for test, permitting expressions like [ expression ].

[edit] See also

• List of Unix programs
• BusyBox coreutils like package for embedded Linux.
• GNU Binary Utilities

[edit] External link

• GNU coreutils homepage
• The coreutils FAQ
• The coreutils manual
• Top Ten Cool Coreutils Commands

view • talk • edit Unix command line programs and builtins (more)
File and file system management:	cat | cd | chmod | chown | chgrp | cp | du | df | file | fsck | ln | ls | lsof | mkdir | mount | mv | pwd | rm | rmdir | split | touch
Process management:	at | chroot | crontab | exit | kill | killall | nice | pgrep | pidof | pkill | ps | sleep | time | top | wait | watch
User Management/Environment:	env | finger | id | mesg | passwd | su | sudo | uname | uptime | w | wall | who | whoami | write
Text processing:	awk | comm | cut | ex | head | iconv | join | less | more | paste | sed | sort | tail | tr | uniq | wc | xargs
Shell programming:	echo | expr | printf | unset	Printing:	lp
Communications: inetd | netstat | ping | rlogin | traceroute	Searching: find | grep | strings	Miscellaneous: banner | bc | cal | man | size | yes

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