The -X keyword edit
-X is a file test that returns true, if the file is executable by real uid/gid.
It takes one argument, either a FILENAME, a FILEHANDLE, or a DIRHANDLE to test the associated file to see, if the file has zero size. If the argument is omitted, it tests $_. -X returns 1 for true and an empty string for false. If the file doesn't exist or can't be examined, it returns undef and sets $! (errno).