linux man page for chgrp

CHGRP(1)							   User Commands							  CHGRP(1)

NAME
       chgrp - change group ownership

SYNOPSIS
       chgrp [OPTION]... GROUP FILE...
       chgrp [OPTION]... --reference=RFILE FILE...

DESCRIPTION
       Change the group of each FILE to GROUP.	With --reference, change the group of each FILE to that of RFILE.

       -c, --changes
	      like verbose but report only when a change is made

       --dereference
	      affect the referent of each symbolic link (this is the default), rather than the symbolic link itself

       -h, --no-dereference
	      affect each symbolic link instead of any referenced file (useful only on systems that can change the ownership of a symlink)

       --no-preserve-root
	      do not treat `/' specially (the default)

       --preserve-root
	      fail to operate recursively on `/'

       -f, --silent, --quiet
	      suppress most error messages

       --reference=RFILE
	      use RFILE's group rather than specifying a GROUP value

       -R, --recursive
	      operate on files and directories recursively

       -v, --verbose
	      output a diagnostic for every file processed

       The  following  options	modify how a hierarchy is traversed when the -R option is also specified.  If more than one is specified, only the
       final one takes effect.

       -H     if a command line argument is a symbolic link to a directory, traverse it

       -L     traverse every symbolic link to a directory encountered

       -P     do not traverse any symbolic links (default)

       --help display this help and exit

       --version
	      output version information and exit

EXAMPLES
       chgrp staff /u
	      Change the group of /u to "staff".

       chgrp -hR staff /u
	      Change the group of /u and subfiles to "staff".

AUTHOR
       Written by David MacKenzie and Jim Meyering.

REPORTING BUGS
       Report chgrp bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report chgrp translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for chgrp is maintained as a Texinfo manual.  If the info and chgrp programs are properly installed  at  your  site,
       the command

	      info coreutils 'chgrp invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							  CHGRP(1)