Another potential danger of glob is its usage in scalar context. It should return the matches one by one, but the iterator is assigned to the place where glob is used and isn't reset when a new parameter is supplied to it: 
#! /usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

open my $fh, '>', $_ for my @files = qw( a1 a2 b1 b2 );

for my $mask ('a*', 'b*') {
    while (my $f = glob $mask) {
        say $f;
        last
    }
}

unlink @files;

[download]

<Reveal this spoiler or all in this thread>

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: To glob or not to glob by choroba
in thread To glob or not to glob by haukex

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