chgrp Changes file group boolchgrp stringfilename mixedgroup Attempts to change the group of the file filename to group (specified by name or number). Only the superuser may change the group of a file arbitrarily; other users may change the group of a file to any group of which that user is a member. &return.success; ¬e.no-remote; ¬e.sm.uidcheck; See also chown and chmod.