Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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grep eth0 /proc/net/arp
IP address HW type Flags HW address Mask Device
192.168.0.1 0x1 0x0 00:00:00:00:00:00 * eth0
192.168.0.2 0x1 0x2 00:2e:e4:c5:91:7b * eth0
Another way is that :traceroute 2>/dev/null google.com -n | awk '/^ [0-9]/{print $2;exit}'