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FAQ 8.29 Why can't my script read from STDIN after I gave it EOF (^D on Unix, ^Z on MS-DOS)?


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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8.29: Why can't my script read from STDIN after I gave it EOF (^D on Unix, ^Z on MS-DOS)?

    Some stdio's set error and eof flags that need clearing. 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.

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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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