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  1. or download this
    $ perl -wle 'my $param = "foo"; if ($param != null) {}'
Unquoted string "null" may clash with future reserved word at -e line 
+1.
Argument "null" isn't numeric in numeric ne (!=) at -e line 1.
Argument "foo" isn't numeric in numeric ne (!=) at -e line 1.
  2. or download this
    $ perl -Mstrict -wle 'my $param = "foo"; if ($param != null) {}'
Bareword "null" not allowed while "strict subs" in use at -e line 1.
Execution of -e aborted due to compilation errors.