CHGRP(1)
NAME
chgrp − change group
USAGE
chgrp [ −f ] group file ...
DESCRIPTION
Chgrp changes the group ID of the files to group. The group may be either a decimal GID or a group name found in the group ID file.
To invoke chgrp, you must belong to the specified group and be the owner of the file, or be the super-user.
No errors are reported when the −f (force) option is given.
FILES
/etc/group