Man pages matching name gfdf in section 1:

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