I have a script that uses the Windows Task Scheduler on my Windows NT server to copy an Excel Spreadsheet to another Server and it works. I would like to have exclusive lock on the Excel file to make sure no one else is writing in it at the same time I am copying it. 
use strict;
my $listFile = "C:\\theData.xls";
my $listFile2 = "\\\\AnotherServer\\dir\\";

open (IN, "$listFile") || die "Cant open $listFile for reading: $!";
flock(IN, LOCK_EX) || die "Cant get LOCK_SH on $listFile: $!";
print(IN);
system("copy $listFile $listFile2 > nul") == 0 || die "Copy failed.";
print "Copy completed";
close IN || die "Cant close $listFile: $!";

[download]
I keep getting error message: Bareword "LOCK_EX" not allowed while "strict subs"

If I use this: flock(IN, 1) instead of this flock(IN, LOCK_EX)
it works.

Please advise how I can get the Lock Exclusive to work?

In reply to Lock on file 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.