Test if an NFS server is accessible
# showmount -e localhost
in this case localhost will be queried for NFS shares ("exports") that it provides.
In case the nfs service is not started you might get the following error message:
clnt_create: RPC: Program not registered
Stupid error message, right? Anyway after starting the NFS service, you will find an output telling you what is available via NFS like this:
# showmount -e localhost Export list for localhost: /public *