Use File::Tie: 
#!perl

use strict;
use warnings;

use Tie::File;

my $dir = q[path/to/dir];

opendir(DIR, $dir) or die "Could not open '$dir': $!\n";
my @files = grep { -T and /a\d+\.txt/ } readdir(DIR);
close DIR;

for my $file (@files) {
   my @lines;
   tie @lines, 'Tie::File', "$dir/$file" or die "Failed tieing '$file'
+: $!\n";
   unshift @lines, $file;
   untie @lines;
}

[download]

Cheers,
CombatSquirrel.
Entropy is the tendency of everything going to hell.

In reply to Re: very basic, just beginning by CombatSquirrel
in thread very basic, just beginning by MiamiGenome

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.