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Linux: Find my IP address using Perl at a shell prompt

Q. How do I find out my IP address assigned to eth0 or ra0 interface using perl?

A. If you need to know the IP address of the UNIX / Linux machine you are running on, use the following perl one liner. Perl don't have any inbuilt facility but combination of ifconfig command ans shell pipes you can craft something as follows to display your system IP address:

Find my IP address using Perl One liner and shell pipes

Type the following command at a shell prompt:

ifconfig -a | perl -ne 'if ( m/^\s*inet (?:addr:)?([\d.]+).*?cast/ ) { print qq($1\n); exit 0; }'

{ 11 comments… add one }

  • raj October 23, 2007, 1:26 pm

    thanks really helpful!

  • Leigh November 7, 2007, 10:42 pm

    For non-root users, put /sbin/ in front of the ifconfig line, so it becomes

    /sbin/ifconfig -a | perl -ne 'if ( m/^\s*inet (?:addr:)?([\d.]+).*?cast/ ) { print qq($1\n); exit 0; }'

  • ashish June 16, 2008, 1:24 pm


    i’m trainne in system admin i working on thin client

    i’ve tried the code above then i get ip addr but when i simple use ifconfig

    i got the error COMMAND NOT FOUND
    can u tell y

  • ian November 18, 2008, 3:38 pm

    You can use gethostbyname in the Socket package to do the work for you:

    use Socket;
    use strict;

    my ($host) = `hostname`;

    my $iaddr = gethostbyname($host);

    if (defined($iaddr)) {
    print (inet_ntoa($iaddr), “\n”);
    } else {
    die (“ipaddr failed to get IP address for $host\n”);

  • Akshatha June 23, 2009, 4:12 am

    very useful.. saved lot of my time :) thanks

  • poisonbit November 28, 2009, 3:46 am

    I’ve made a bash function based in these post and comments.


  • Deepti March 5, 2010, 8:18 pm

    very useful really

  • Peter Burkholder October 3, 2011, 9:44 pm

    Thanks for figuring my ifconfig regex parsing for me. Saved me a few minutes, and it works for Mac and Linux.

  • Snap (damian.snap@gmail.com) October 9, 2011, 7:41 am

    use LWP::UserAgent;
    $browser = LWP::UserAgent -> new() or die “problem dog?\n”;
    $browser -> agent(“niggaBrowzaaa”);
    sub encontrarIP{
    $result = $browser->request(HTTP::Request->new(GET=>$_[0]));
    $content = $result->content;
    $urlLength = @url;

    for ($i=0;$i didn’t worked.\n”;
    print “\nNONE of them worked WTF !!\n”;
    print “worst luck than me ?? \n”;
    print “nah ! you probably aren’t connected\n”;


  • alex toderita October 11, 2013, 11:37 am
    /sbin/ip -o -4 addr show eth0 | perl -lane 'print $1 if /h(d. E)//'

    More verbose… for the kill…

    perl -MSocket -e 'require "sys/ioctl.ph"; socket($sock, PF_INET, SOCK_STREAM, (getprotobyname("tcp"))[2]); $buf = pack("a256", "eth0"); ioctl($sock, SIOCGIFADDR(), $buf); @addr= unpack("x20 C4", $buf); print join(".", @addr),"n";'

    • Paul Rice April 27, 2014, 8:21 pm

      God bless you, Sir! lol

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