Man pages matching name gfchmod in section 1:

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