show remote NFS mounts on host
showmount [-ade] [host]
The showmount utility shows status information about the NFS server on the specified host. By default, it prints the names of all hosts that have NFS filesystems mounted on that host.
Because the NFS server is stateless, the mount daemon (mountd) running on the server has only an approximate idea of the actual mounts. The showmount utility displays this information as accurately as the mount daemon reports it.
mountd,
mount_nfs
RFC 1094 (Appendix A: ``Mount Protocol
Definition'')