chgrp(1) on FreeBSD
The text 49631cf56fb0, as FreeBSD 4.2-RELEASE, FreeBSD 4.1.1-RELEASE, FreeBSD 4.1-RELEASE, FreeBSD 4.0-RELEASE shipped it.
change group
Flags it lists
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-H -
-L -
-P -
-R -
-f -
-h -
-v