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Perl Programming Language

FAQ 8.6 How do I check whether input is ready on the keyboard?


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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8.6: How do I check whether input is ready on the keyboard?

    The easiest way to do this is to read a key in nonblocking mode with the
    Term::ReadKey module from CPAN, passing it an argument of -1 to indicate
    not to block:

            use Term::ReadKey;

            ReadMode('cbreak');

            if (defined ($char = ReadKey(-1)) ) {
                    # input was waiting and it was $char
            } else {
                    # no input was waiting
            }

            ReadMode('normal');                  # restore normal tty settings

--------------------------------------------------------------------

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
perlfaq.pod.

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