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use CGI qw(-debug);

use CGI qw(-debug);
use strict;
...

my $cgi = CGI->new;
print $cgi->param('a');

perl -d a.pl

perl -d a.pl

...
                                                                      
+                                                                     
+                    DB<1> p $cgi->param('a')
a b v d
                                                                      
+                                                                     
+                    DB<2> q