FAQ 8.23 How can I open a pipe both to and from a command?

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

This is an excerpt from the latest version perlfaq8.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .


8.23: How can I open a pipe both to and from a command?

    The "IPC::Open2" module (part of the standard perl distribution) is an
    easy-to-use approach that internally uses "pipe()", "fork()", and
    "exec()" to do the job. Make sure you read the deadlock warnings in its
    documentation, though (see IPC::Open2). See "Bidirectional Communication
    with Another Process" in perlipc and "Bidirectional Communication with
    Yourself" in perlipc

    You may also use the "IPC::Open3" module (part of the standard perl
    distribution), but be warned that it has a different order of arguments
    from "IPC::Open2" (see IPC::Open3).


The perlfaq-workers, a group of volunteers, maintain the perlfaq. They
are not necessarily experts in every domain where Perl might show up,
so please include as much information as possible and relevant in any
corrections. The perlfaq-workers also don't have access to every
operating system or platform, so please include relevant details for
corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

If you'd like to help maintain the perlfaq, see the details in

Site Timeline