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  1. or download this
    package X;
use CGI;  
$q = CGI->new;
...
$r = CGI->new;

print $X::q->param('a'), " = ", $r->param('a');
  2. or download this
    friday:~ $ perl cgi
(offline mode: enter name=value pairs on standard input)
a=123
=
123 = 123