$ ssh localhost ping -c 2 localhost
PING localhost.localdomain (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=64 time=0.033 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=2 ttl=64 time=0.021 ms

--- localhost.localdomain ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.021/0.027/0.033/0.006 ms
RC:0 $ ssh localhost ping -c 2 localhosta
ping: unknown host localhosta
RC:2 $