GNU bug report logs - #50129
-f - option doesn't respond to single EOF from TTY.

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Package: grep;

Reported by: Kaz Kylheku <kaz <at> kylheku.com>

Date: Fri, 20 Aug 2021 01:01:01 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Kaz Kylheku <kaz <at> kylheku.com>
To: 50129 <at> debbugs.gnu.org
Subject: bug#50129: -f - option doesn't respond to single EOF from TTY.
Date: Thu, 19 Aug 2021 17:59:53 -0700

This reproduces on grep 3.1 on Ubuntu.

The command:

   grep -f -

should accept a list of patterns from standard input, like this:

   $ grep -f -
   pat1
   pat2
   pat3
   [Ctrl-D]

Upon receiving the EOF indication (zero byte read), the program
should immediately conclude that the list of patterns has ended,
and begin processing the input using the patterns.

This does not seem to be working. After a single Ctrl-D, grep is
still accumulating patterns:

It appears that Ctrl-D must be issued twice:

   $ grep -f -
   pat1
   [Ctrl-D] ;; effectively ignored
   pat2     ;; can add more patterns
   pat3
   [Ctrl-D]
   [Ctrl-D] ;; OK, now we are in the matching loop.
   pat3blahblah
   pat3blahblah
   ...

Cheers ...
This bug report was last modified 3 years and 275 days ago.

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