L~R ... thanks for taking the time with me..

It turns out that my test code (above) does indeed reproduce the problem, but only on the server in question, not my local machine (yes, the overall script is CGI).

The last error messages seem to be relevant too. When i run this script: 

#!/usr/bin/perl -Tw

use Tie::File;

use strict;

my @array;
my $file = "./file.txt";
my $line = "this is a really long line of text (sortof)";

tie @array, 'Tie::File', $file;

unshift @array, $line;

untie @array

[download]

from the command line, i get:
bash-2.05a$ ./tie
Use of uninitialized value in read at /usr/lib/perl5/5.6.1/Tie/File.pm line 699, <FH> line 7. Use of uninitialized value in read at /usr/lib/perl5/5.6.1/Tie/File.pm line 699, <FH> line 7.

Line 7 of my script is the "my @array;" declaration

The target file is modified, but not as expected, and repeated executions of the test script don't change the file any further. I'm beginning to suspect my installation of Tie::File or Perl itself, since on my local machine this exact same script works as one would think it should.

perl -v reports v5.6.1

In reply to Re: Re: Re: Re: Tie::File strangeness with unshift by u914
in thread Tie::File strangeness with unshift by u914

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.