4.2BSD/usr/man/man1/chgrp.1

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.TH CHGRP 1 "28 April 1982"
.UC 4
.SH NAME
chgrp \- change group
.SH SYNOPSIS
.B chgrp
[ -f ]
group file ...
.SH DESCRIPTION
.I Chgrp
changes the group-ID of the
.I files
to
.IR group .
The group may be either a decimal GID or
a group name found in the group-ID file.
.PP
The user invoking 
.I chgrp
must belong
to the specified group and be the owner of the file, or be the super-user.
.PP
No errors are reported when the
.B \-f
(force) option is given.
.SH FILES
/etc/group
.SH "SEE ALSO"
chown(2),
passwd(5),
group(5)