Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
rpc.ypxfrd --version (return code: 0)
rpc.ypxfrd (ypserv) 2.19
rpc.ypxfrd --help (return code: 0)
usage: rpc.ypxfrd [--debug] [-d path] [-p port]