How do i get the default gateway in LINUX given the destination?

Question

I\'m trying to get the default gateway, using the destination 0.0.0.0

I used this command: netstat -rn | grep 0.0.0.0

And it return

Answer 1

This simple perl script will do it for you.

#!/usr/bin/perl

$ns = `netstat -nr`;

$ns =~ m/0.0.0.0\s+([0-9]+.[0-9]+.[0-9]+.[0-9]+)/g;

print $1

Basically, we run netstat, save it to $ns. Then find the line that starts off with 0.0.0.0. Then the parentheses in the regex saves everything inside it into $1. After that, simply print it out.

If it was called null-gw.pl, just run it on the command like:

perl null-gw.pl

or if you need it inside a bash expression:

echo $(perl null-gw.pl)

Good luck.