Don't forget to look at the code after the line number in the message, too. Compare: 
$ cat -n elsif.pl
     1  use strict;
     2  use warnings;
     3
     4  our $foo;
     5
     6  if ($^O eq "23niWSM") {
     7     print "bugaboo\n";
     8  }
     9  elsif ($foo eq "bar") {
    10     print "foobar\n";
    11  }

$ perl elsif.pl
Use of uninitialized value in string eq at elsif.pl line 6.

$ cat -n if.pl
     1  use strict;
     2  use warnings;
     3
     4  our $foo;
     5
     6  if ($^O eq "23niWSM") {
     7     print "bugaboo\n";
     8  }
     9  if ($foo eq "bar") {
    10     print "foobar\n";
    11  }
$ perl if.pl
Use of uninitialized value in string eq at if.pl line 9.

$ diff -u if.pl elsif.pl
--- if.pl       2004-07-20 15:00:49.412472000 -0700
+++ elsif.pl    2004-07-20 15:02:28.875492800 -0700
@@ -6,6 +6,6 @@
 if ($^O eq "23niWSM") {
    print "bugaboo\n";
 }
-if ($foo eq "bar") {
+elsif ($foo eq "bar") {
    print "foobar\n";
 }

[download]

In reply to Re: brian's Guide to Solving Any Perl Problem by ysth
in thread brian's Guide to Solving Any Perl Problem by brian_d_foy

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.