отправить ICMP ECHO_REQUEST на сетевые узлы (send ICMP ECHO_REQUEST to network hosts)
История (History)
The ping command appeared in 4.3BSD.
The version described here is its descendant specific to Linux.
As of version s20150815, the ping6 binary doesn't exist anymore.
It has been merged into ping. Creating a symlink named ping6
pointing to ping will result in the same functionality as before.
