Coreutils Guide, Meaning , Facts, Information and Description

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 to function. It is a combination of a number of earlier packages, including textutils, shellutils, and fileutils along with some other miscellaneous utilties.

Table of contents

1 Coreutils versus traditional Unix programs 2 Programs included in coreutils 3 See also 4 External link

Coreutils versus traditional Unix programs

The GNU core utilities support long options as parameterss to the commands, and the "--help" option is also available to provide some fairly verbose information about what the program is, and how it is to be used. This is in contrast to more traditional Unix operating systems, which generally don't support long options, and usually only have very terse help screens (if they exist at all).

For instance, if a user doesn't know how to use the cat program on a GNU/Linux machine, that person could just type in "cat --help" and get idea of what the program does.

[mike@3po][~]$ cat --help
Usage: cat [OPTION] [FILE]...
Concatenate FILE(s), or standard input, to standard output.

 -A, --show-all           equivalent to -vET
 -b, --number-nonblank    number nonblank output lines
 -e                       equivalent to -vE
 -E, --show-ends          display $ at end of each line
 -n, --number             number all output lines
 -r, --reversible         use \\ to make the output reversible, implies -v
 -s, --squeeze-blank      never more than one single blank line
 -t                       equivalent to -vT
 -T, --show-tabs          display TAB characters as ^I
 -u                       (ignored)
 -v, --show-nonprinting   use ^ and M- notation, except for LFD and TAB
     --help     display this help and exit
     --version  output version information and exit

With no FILE, or when FILE is -, read standard input.

Report bugs to .

In contrast, the cat program on a Solaris 8 machine does not produce very useful information.

hick0088@garnet ~>$ cat --help
cat: illegal option -- -
usage: cat [ -usvtebn ] [-|file] ...

Programs included in coreutils

The Debian coreutils-5.2.1-2 package (a slightly modified version of coreutils version 5.2.1) contains these programs:

• basename
• cat
• chgrp
• chmod
• chown
• chroot
• cksum
• comm
• cp
• csplit
• cut
• date
• dd
• df
• dir
• dircolors
• dirname
• du
• echo
• env
• expand
• expr
• factor
• false
• fmt
• fold
• groups
• head
• hostid
• id
• install
• join
• link
• ln
• logname
• ls
• md5sum
• mkdir
• mkfifo
• mknod
• mv
• nice
• nl
• nohup
• od
• paste
• pathchk
• pinky
• pr
• printenv
• printf
• ptx
• pwd
• readlink
• rm
• rmdir
• sha1sum
• seq
• shred
• sleep
• sort
• split
• stat
• stty
• sum
• sync
• tac
• tail
• tee
• test
• touch
• tr
• true
• tsort
• tty
• uname
• unexpand
• uniq
• unlink
• users
• vdir
• wc
• who
• whoami
• yes

See also

• List of Unix programs

External link

• Coreutils homepage

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