I'm surprised nobody mentioned using Tie::File so you can use the numeric values as array indices. 

#! /usr/bin/perl -w

use strict;
use Fcntl 'O_RDONLY';
use Tie::File;


# Path to file containing lines as arg
my $linesPath = shift;

# Tie the file read-only, if you want to read only, to be safe
tie my @linesFile, 'Tie::File', $linesPath, mode => O_RDONLY
    or die "Can't open file $linesPath: $!";

while(<DATA>) {
    chomp;

    # $_ - 1, I'm assuming that the list isn't 0-based
    print "$linesFile[$_ - 1]\n";
}

untie @linesFile;

__DATA__
1
3
4
7

[download]

In reply to Re: printing specific lines by dmorelli
in thread printing specific lines by Anonymous Monk

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.