It's generally a bad idea to edit a file in place.

What I'd suggest is that you create a new file with the desired content, and the move the new file to the place of the old file.

You could first read things that you want to append into @list, and then do the "real" operation: 

use File::Copy; # for move()
open my $of, '<', $old_file or die "Can't read $old_file: $!";
open my $nf, '>', $new_file or die "Can't write $new_file: $!";
my $line_number = 0;
while (my $line = <$of>){
    chomp $line;
    print $nf $line, $list[$line_number];
}
close $nf;
close $of;
move $new_file, $old_file;

[download]

In reply to Re: Need a little help appending lines by moritz
in thread Need a little help appending lines by perl4ever

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.