Unquoted string "file" may clash with future reserved word at c.pl line 3.
Unquoted string "file" may clash with future reserved word at c.pl line 9.
Unquoted string "file" may clash with future reserved word at c.pl line 11.
Unquoted string "file" may clash with future reserved word at c.pl line 16.
Statement unlikely to be reached at c.pl line 11.
        (Maybe you meant system() when you said exec()?)