gfhostgroup  [-P path] [ host  [[host...]]]
gfhostgroup  [-P path]  -s host   groupname 
gfhostgroup  [-P path]  -r host  [[host...]]
gfhostgroup manages Gfarm host groups (so called filesystem node group or fsngroup for short) in Gfarm file system. The host group is used by the Replication-Attribute-based File Replication.
Default action displays all registered host groups. Any user can display the host groups. Gfarm administrators can set the host group of specified hosts by using -s option, and the one also can remove the host group of specified hosts by using -r option.