The -p keyword Edit
-p is a file test that tests, if the file is a named pipe (FIFO), or filehandle is a pipe.
It takes one argument, either a FILENAME, a FILEHANDLE, or a DIRHANDLE to test the associated file to see, if something is true about it. If the argument is omitted, it tests $_. -p 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).
-p DIRHANDLE -p EXPRESSION -p FILEHANDLE -p FILENAME -p