Hi mnooning,

As BrowserUK says, it's the line number of the most recently opened filehandle.

Here's a (slightly contrived) example: 

#!/usr/bin/perl

use strict;
use warnings;

use FileHandle;

my $iam = $0;
my $fh = new FileHandle;
open($fh, "<", $iam) or die "Can't open myself:  '$iam' ($!)\n";

my $cnt = 15;
while (my $line = <$fh>) {
    chomp $line;
    printf "%2d:  %s\n", (10 / $cnt--), $line;
}

[download]

When saved as the file "mytest", and run, it errors out on the 15th line, where a division by zero error occurs: 

Illegal division by zero at mytest line 15, <GEN0> line 16.

[download]
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/

In reply to Re: Where does <GEN1> come from? by liverpole
in thread Where does <GEN1> come from? by mnooning

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.