root@sugzum:~/host# cat b2.pl
 #!/usr/bin/perl
 use feature qw(say);
 use Mozilla::PublicSuffix qw(public_suffix);
 open F, &quot;<host.txt&quot; or die $!;
 while (<F>) {
 $hostname = &quot;$_&quot;;
 }
 close F;
 my $tld = public_suffix($hostname)
 or die &quot;Invalid TLD found in '$hostname'&quot;;
 $hostname =~ /([^.]+).\Q$tld\E$/
 or die &quot;Couldn't find domain name in '$hostname'&quot;;
 my $domainname= $1;
 print &quot;Domain name is $domainname.$tld\n&quot;;
 
root@sugzum:~/ssh2smtp# cat host.txt 
200-206-30-98.customer.tdatabrasil.net.br
root@sugzum:~/ssh2smtp# perl b2.pl
Invalid TLD found in '200-206-30-98.customer.tdatabrasil.net.br
' at b2.pl line 9.

[download]

Sorry, I'm a beginner. I can't figure it out to understand how this works.

In reply to Re^4: Module to get domain name from hostname by gatkins
in thread Module to get domain name from hostname by gatkins

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.