I assumed you knew more about Perl. My fault. When using a function you do not know yet, consult its documentation.
Here is what I had in mind: 
#!/usr/bin/perl
use warnings;
use strict;

my $infile = 'orders.txt';
my $output = 'orders_today.txt';

open my $IN, '<', $infile or die "ERROR: Cannot open '$infile': $!";

my @out;
while (<$IN>) {
    chomp;
    my @text = split /\t/;
    push @out, [@text];
}

open my $OUT, '>', $output or die "Cannot open '$output': $!";
print {$OUT} map "@$_\n", sort { $a->[10] cmp $b->[10] } @out;

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: Sorting one column of results by choroba
in thread Sorting one column of results by perlnoobster

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.