# phpman > perldoc > pipe

    pipe READHANDLE,WRITEHANDLE
            Opens a pair of connected pipes like the corresponding system
            call. Note that if you set up a loop of piped processes,
            deadlock can occur unless you are very careful. In addition,
            note that Perl's pipes use IO buffering, so you may need to set
            $| to flush your WRITEHANDLE after each command, depending on
            the application.

            Returns true on success.

            See [IPC::Open2](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3AOpen2/markdown), [IPC::Open3](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3AOpen3/markdown), and "Bidirectional Communication
            with Another Process" in perlipc for examples of such things.

            On systems that support a close-on-exec flag on files, that flag
            is set on all newly opened file descriptors whose "fileno"s are
            *higher* than the current value of $^F (by default 2 for
            "STDERR"). See "$^F" in perlvar.