Chgrp

chgrp

Example usage of chgrp command to change the files' groups
Developer(s)	AT&T Bell Laboratories
Initial release	May 1975; 49 years ago (1975-05)
Written in	Plan 9: C
Operating system	Unix, Unix-like, Plan 9, Inferno, IBM i
Platform	Cross-platform
Type	Command
License	Plan 9: MIT License

The chgrp (from change group) command may be used by unprivileged users on various operating systems to change the group associated with a file system object (such as a computer file, directory, or link) to one of which they are a member. A file system object has 3 sets of access permissions, one set for the owner, one set for the group and one set for others. Changing the group of an object could be used to change which users can write to a file.

The chgrp command was originally developed as part of the Unix operating system by AT&T Bell Laboratories.

It is also available in the Plan 9 and Inferno operating systems and in most Unix-like systems.

The chgrp command has also been ported to the IBM i operating system.^[1]

The version of chgrp bundled in GNU coreutils was written by David MacKenzie.^[2]

chgrp [options] group FSO

• The group parameter specifies the new group with which the files or directories should be associated. It may either be a symbolic name or an identifier.
• The FSO specifies one or more file system objects, which may be the result of a glob expression like *.conf.

-R recurse through subdirectories.

-v verbosely output names of objects changed. Most useful when "FSO" is a list.

-f force or forge ahead with other objects even if an error is encountered.

$ ls -l *.conf
-rw-rw-r--   1 gbeeker  wheel          3545 Nov 04 2011  prog.conf
-rw-rw-r--   1 gbeeker  wheel          3545 Nov 04 2011  prox.conf
$ chgrp staff *.conf
$ ls -l *.conf
-rw-rw-r--   1 gbeeker  staff          3545 Nov 04 2011  prog.conf
-rw-rw-r--   1 gbeeker  staff          3545 Nov 04 2011  prox.conf

The above command changes the group associated with file prog.conf from wheel to staff (provided the executing user is a member of that group). This could be used to allow members of staff to modify the configuration for programs prog and prox.

• chmod
• chown
• Group identifier (Unix)
• List of Unix commands
• id (Unix)

The Wikibook Guide to Unix has a page on the topic of: Commands

• chgrp: change the file group ownership – Shell and Utilities Reference, The Single UNIX Specification, Version 4 from The Open Group
• chgrp(1) – Plan 9 Programmer's Manual, Volume 1
• chgrp(1) – Inferno General commands Manual