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


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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 .

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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).



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