Linux/Unix: Below is the commands to filter ifconfig to show only the eth0 IP address in Linux. Perl Script: Option 1 eth0 | grep “inet addr”| awk {‘print $2′} | perl -e ‘while(<>){ ($a,$b)=split/:/; print $b; }’ Option 2 ifconfig eth0 | grep “inet addr” | perl -e ‘while (<>) { ($inet, $addr, $ip, $others) [...]