Lệnh đặt giới hạn thời gian cho lệnh ping trên Linux

PING 123host.vn (123.30.108.142) 56(84) bytes of data.
64 bytes from 123host.vn (123.30.108.142): icmp_seq=1 ttl=57 time=1.94 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=2 ttl=57 time=2.22 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=3 ttl=57 time=2.10 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=4 ttl=57 time=2.03 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=5 ttl=57 time=1.90 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=6 ttl=57 time=1.84 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=7 ttl=57 time=1.94 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=8 ttl=57 time=1.90 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=9 ttl=57 time=1.84 ms
64 bytes from 123host.vn (123.30.108.142): icmp_seq=10 ttl=57 time=1.91 ms

--- 123host.vn ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9015ms
rtt min/avg/max/mdev = 1.839/1.961/2.222/0.115 ms