Ping is a program that is used to test the reachability of a host. It also measures the time it takes to send the packet and receive one. It does this by sending a ICMP echo request packet and waiting for a reply. Pretty much all Linux flavours will come with Ping pre-installed.
How to ping using a specific interface
$ ping -I wlan0 google.com
This will ping google using the wlan0 interface
How to send a certain amount of ping requests
$ ping -c 4 google.com
This will send 4 ICMP echo requests to google
How to change the timeout of a ping
$ ping -w 5 google.com
This changes the timeout of the ICMP request to 5 seconds.
How to ping yourself to check your interface is working
$ ping 0
$ ping 127.0.0.1
$ ping localhost
They all essentially do the same thing which is ping yourself.
Most ping output should look something like this:
$ ping google.com PING google.com (126.96.36.199): 56 data bytes 64 bytes from 188.8.131.52: icmp_seq=0 ttl=118 time=3.459 ms 64 bytes from 184.108.40.206: icmp_seq=1 ttl=118 time=3.106 ms 64 bytes from 220.127.116.11: icmp_seq=2 ttl=118 time=5.924 ms 64 bytes from 18.104.22.168: icmp_seq=3 ttl=118 time=79.037 ms 64 bytes from 22.214.171.124: icmp_seq=4 ttl=118 time=6.458 ms 64 bytes from 126.96.36.199: icmp_seq=5 ttl=118 time=37.407 ms ^C --- google.com ping statistics --- 6 packets transmitted, 6 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 3.106/22.565/79.037/27.957 ms