http://www.perlmonks.org?node_id=384262


in reply to Deleting windows environment variables

Instead of looking for what to delete, why not keep only what you want ?

BEGIN {
  my %e = %ENV;
  %ENV = (
     PATH_INFO => $e{PATH_INFO},
     QUERY_STRING => $e{QUERY_STRING},
     REMOTE_ADDR => $e{REMOTE_ADDR},
     etc...
     );
}

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In Section Seekers of Perl Wisdom