http://www.gsp.com/cgi-bin/man.cgi?section=1&topic=leave
or just
man leave
if it’s already on your system. My FreeBSD system had it by default.
http://www.gsp.com/cgi-bin/man.cgi?section=1&topic=leave
or just
man leave
if it’s already on your system. My FreeBSD system had it by default.