Dear Monks,
I cannot explain the following behavior of glob in the script.
Given is a directory U:/TEMP/TEMP with three subdirectories /A, /B and /C.
Each directory contains a file:
U:/TEMP/TEMP/A/Test01.txt
U:/TEMP/TEMP/C/Test03.txt
U:/TEMP/TEMP/B/Test02.txt

[download]
If I write the script the following way: 
#!/usr/bin/perl
use strict;
use warnings;

my %address =
(
    A     => qq{U:/TEMP/TEMP/A},
    B    => qq{U:/TEMP/TEMP/B},
    C    => qq{U:/TEMP/TEMP/C},
);

for my $t (keys %address)
{
    print "$t : $address{$t} : ", glob ("$address{$t}/Test*"), "\n";
}

[download]
then it prints as shown: 
A : U:/TEMP/TEMP/A : U:/TEMP/TEMP/A/Test01.txt
C : U:/TEMP/TEMP/C : U:/TEMP/TEMP/C/Test03.txt
B : U:/TEMP/TEMP/B : U:/TEMP/TEMP/B/Test02.txt

[download]
If I write it in the form: 
#!/usr/bin/perl
use strict;
use warnings;

my %address =
(
    A     => qq{U:/TEMP/TEMP/A},
    B    => qq{U:/TEMP/TEMP/B},
    C    => qq{U:/TEMP/TEMP/C},
);

for my $t (keys %address)
{
    my $file = glob ("$address{$t}/Test*");
    print "$t : $address{$t} : $file, \n";
}

[download]
then the output is as follows: 
A : U:/TEMP/TEMP/A : U:/TEMP/TEMP/A/Test01.txt,
Use of uninitialized value $file in concatenation (.) or string at ...
+ line 15.
C : U:/TEMP/TEMP/C : ,
B : U:/TEMP/TEMP/B : U:/TEMP/TEMP/B/Test02.txt,

[download]
Why it behaves itself different?
Thanks in advance.
VE

In reply to glob behavior by vagabonding electron

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.