Hi Athanasius! I tested the -s operator on my Windows system with a null file (zero length). I do get a numeric 0 for a null file. Here is the test code. I did verify that 'zero' is indeed of 0 length with file manager. I think -s returns undef if the file does not exist (which is different than exists, but empty). 
#!usr/bin/perl
use warnings;
use strict;

`copy NUL zero`;  #create empty file cp dev/null zero on unix?
my $size = -s 'zero';
print $size;      #does print "0"
__END__
0

[download]
Update: FYI for Windows users who don't use the command line much... NUL is a reserved word in the Windows file system for "the bit bucket". Unix folks are familiar with this concept, but sometimes Windows users aren't. someprogram > NUL does not create a file called "NUL", this just throws away STDOUT and it goes nowhere, i.e., the "bit bucket". There is no file called "NUL". To make an empty file, I copied the "bit bucket" to a file.

In reply to Re^2: Sort directory by file size by Marshall
in thread Sort directory by file size by nnigam1

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.