Man pages matching name gfchgrp in section 1:

gfchgrp.1.en	debian 10 / gfarm-client
gfchgrp.1.ja	debian 10 / gfarm-client
gfchgrp.1.en	debian 11 / gfarm-client
gfchgrp.1.ja	debian 11 / gfarm-client
gfchgrp.1.en	debian 12 / gfarm-client
gfchgrp.1.ja	debian 12 / gfarm-client