The (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. History The 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 command has also been ported to the IBM i operating system. Syntax 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 . Frequently implemented options recurse through subdirectories. verbosely output names of objects changed. Most useful when is a list. force or forge ahead with other objects even if an error is encountered. Example $ 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 to (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 and . See also chmod chown Group identifier (Unix) List of Unix commands id (Unix) References External links Operating system security Standard Unix programs Unix SUS2008 utilities Plan 9 commands Inferno (operating system) commands IBM i Qshell commands de:Unix-Kommandos#Benutzer- und Rechteverwaltung