chgrp - change group
chgrp [-R] [owner:]group file ...
-R Change directory hierarchies
chgrp system file1 file2
# Make system the group of the files
chrgp -R other dir1 # Make other the group of all files below dir1
The group field (and optionally owner field) of the named files is
changed to group and owner . Alternatively, a decimal gid (uid) may be
specified instead of a group name. If the -R flag is used, the changes
will be applied recursively to all files in named directories. Only the
superuser may execute this command to set arbitrary groups. Normal users
can only change the group if they own the file, and the group is their
own group (Minix), or one of their supplementary groups (Minix-vmd).
chown(8), chmod(1), ls(1), chown(2).