/usr/bin/chgrp

Change the group of each FILE to GROUP.

Usage: chgrp [OPTION]... GROUP FILE...
       chgrp [OPTION]... --reference=RFILE FILE...

Arguments:
  <GROUP>
  <FILE>...

Options:
      --help               Print help information.
  -c, --changes            like verbose but report only when a change is made
  -f, --silent
      --quiet              suppress most error messages
  -v, --verbose            output a diagnostic for every file processed
      --preserve-root      fail to operate recursively on '/'
      --no-preserve-root   do not treat '/' specially (the default)
      --reference <RFILE>  use RFILE's group rather than specifying GROUP values
      --from <GROUP>       change the group only if its current group matches GROUP
  -R, --recursive          operate on files and directories recursively
  -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)
      --dereference        affect the referent of each symbolic link (this is the default), rather
                           than the symbolic link itself
  -h, --no-dereference     affect symbolic links instead of any referenced file (useful only on
                           systems that can change the ownership of a symlink)
  -V, --version            Print version