If you're satisfied to limit yourself to just Linux you should be able to get away rather simply with parsing the output from ifconfig -a and looking for just those interfaces matching /^eth\d+/. 

open( IFCFG, "ifconfig -a |" ) or die "Can't open pipe from ifconfig: 
+$!\n";
my %ifs;
while( <IFCFG> ) {
  chomp;
  ## ...
}
close( IFCFG );

[download]

--
We're looking for people in ATL

In reply to Re: How to list all network interfaces and their ip address in Linux by Fletch
in thread How to list all network interfaces and their ip address in Linux by bahadur

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.