On the server with a SunOS 4.0 operating system or compatible version, enter ls /usr/etc/rpc.pcnfsd.
See if the output shows that the rpc.pcnfsd daemon is already installed. You may also list other directories such as /etc/usr/bin, /bin, and /usr/lib, in case it is not in the expected directory.
On a server with a SunOS 5.4 operating system or compatible version, enter ls /opt/SUNWpcnfs/sbin/rpc.pcnfsd. See if the output shows that the rpc.pcnfsd daemon is already installed.