chgrp – change file group
group file ...
The group of
each named file
is changed to
which should be a name known to the server holding the file.
A file’s group can be changed by the file’s owner, if the
owner is a member of the new group,
or by the leader of both
the file’s current group and the new group.
option are synonyms; they specify that the
is to be set, rather than the group.
They are ineffectual unless the file server is in the bootstrap
state that permits changing file ownership.