These days I would prefer something like: 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11156715
use warnings;
use Path::Tiny;

sub delete_comments_from_file
  {
  path($_)->edit( sub { s/#.*//g } ) for @_;
  }

my $file = '/tmp/foobar.tmp';

path($file)->spew( <<END );
one # a comment
two no comment
three # more comments;
END

print path($file)->slurp;
print '-' x 50, "\n";

delete_comments_from_file( $file ); # NOTE

print path($file)->slurp;

[download]

Outputs: 

one # a comment
two no comment
three # more comments;
--------------------------------------------------
one 
two no comment
three

[download]

There is also a edit_lines() version for 'one-line-at-a-time'.

In reply to Re: Avoid re-invocation for -pie processing by tybalt89
in thread Avoid re-invocation for -pie processing by seismofish

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.