chgrp(1)

     NAME
          chgrp - change the group ownership of files

     SYNOPSIS
          chgrp [-Rcfv] [--recursive] [--changes] [--silent] [--quiet]
          [--verbose] [--help] [--version] group file...

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of chgrp.  chgrp
          changes the group ownership of each given file to the named
          group, which can be either a group name or a numeric group
          ID.

        OPTIONS
          -c, --changes
               Verbosely describe only files whose ownership actually
               changes.

          -f, --silent, --quiet
               Do not print error messages about files whose ownership
               cannot be changed.

          -v, --verbose
               Verbosely describe ownership changes.

          -R, --recursive
               Recursively change ownership of directories and their
               contents.

          --help
               Print a usage message on standard output and exit
               successfully.

          --version
               Print version information on standard output then exit
               successfully.