This increments sno and cno, but I did this just for fun. 
#!/usr/bin/perl

use strict;
use warnings;
use Tie::CountLoop;

tie my $counter, 'Tie::CountLoop', 'sno:10'; 
tie my $counter1, 'Tie::CountLoop', 'cno:20';

my $t = tied $counter;
my $t1 = tied $counter1;
$t->auto(1);
$t1->auto(1);
print "    <<$counter>>:10    \n",
      "    <<$counter1>>:20    \n";

[download]

In reply to Re: Script to update a value in text file by Khen1950fx
in thread Script to update a value in text file by amvarma

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.