FAQ 8.6 How do I check whether input is ready on the keyboard?
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From: PerlFAQ Server on 2 Jun 2010 00:00 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 . -------------------------------------------------------------------- 8.6: 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. |