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  1. or download this
    #!/usr/bin/perl

...
use strict;

my $var;
  2. or download this
    package Amel;
use strict;
...
my $var = "Balaban";

print $Amel::var, " $var\n";
  3. or download this
    #!/usr/bin/perl

...
$main::var = "string";

print $main::var, "\n";