FAQ 8.29 Why can't my script read from STDIN after I gave it EOF (^D on Unix, ^Z on MS-DOS)?
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From: PerlFAQ Server on 18 Jul 2010 06:00 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 . -------------------------------------------------------------------- 8.29: Why can't my script read from STDIN after I gave it EOF (^D on Unix, ^Z on MS-DOS)? This happens only if your perl is compiled to use stdio instead of perlio, which is the default. Some (maybe all?) stdios set error and eof flags that you may need to clear. The "POSIX" module defines "clearerr()" that you can use. That is the technically correct way to do it. Here are some less reliable workarounds: 1 Try keeping around the seekpointer and go there, like this: $where = tell(LOG); seek(LOG, $where, 0); 2 If that doesn't work, try seeking to a different part of the file and then back. 3 If that doesn't work, try seeking to a different part of the file, reading something, and then seeking back. 4 If that doesn't work, give up on your stdio package and use sysread. -------------------------------------------------------------------- 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. |