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  1. or download this
    package GlobalTest;

$GLOBALA = 10;

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

...
print "Content-type: text/plain\n\n";

print $GlobalTest::GLOBALA;
  3. or download this
    #!/usr/bin/perl

...
$GlobalTest::GLOBALA=30;

print $GlobalTest::GLOBALA;