CHGRP(1) General Commands Manual CHGRP(1)
chgrp - change the group ownership of a file
chgrp [ -f ] [ -R ] groupfilename...
chgrp changes the group ID (GID) of the filenames given as arguments to
group. The group may be either a decimal GID or a group name found in
the GID file, /etc/group.
You must belong to the specified group and be the owner of the file, or
be the super-user.
-f Force. Do not report errors.
-R Recursive. chgrp descends through the directory, and any subdi-
rectories, setting the specified GID as it proceeds. When sym-
bolic links are encountered, their group is changed, but they
are not traversed.
chown(2V), group(5), passwd(5)
9 September 1987 CHGRP(1)