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Date: Thu, 16 Jul 2015 20:04:10 -0600
From: "John Hein" <3fbmqnhaz4@snkmail.com>
To: cygwin@cygwin.com
Subject: Re: --line-regexp option with null data
In-Reply-To: <CAAXzdLWo4nvaJBMOBYsOYeCdrgw_O=8CM_H_kwfxnU=AqnuOjA@mail.gmail.com>
References: <CAAXzdLWo4nvaJBMOBYsOYeCdrgw_O=8CM_H_kwfxnU=AqnuOjA@mail.gmail.com>

Steven Penny svnpenn-at-gmail.com |cygwin_ml_nodigest| wrote at 20:29 -0500 on Jul 16, 2015:
 > Consider this command:
 >
 >     printf 'alpha\nbravo\ncharlie\n' | grep --line-regexp --quiet bravo
 >
 > grep sees 3 lines separated by newline, and matches the bravo line. Now consider
 > this command:
 >
 >     printf 'alpha\0bravo\0charlie\0' | grep --line-regexp --quiet bravo
 >
 > My thinking tells me that because I have not used `--null-data`, grep should see
 > 1 or even 0 lines separated by newline, and fail to match a `bravo` followed by
 > newline. However it does not, it succeeds just like the first command, why is
 > this?
 >
 > Note I also tried this on Debian with Grep 2.2 and it works as expected.
 >
 > http://stackoverflow.com/q/31467045

cygwin grep is detecting the input as binary which seems to be
overriding the 'match the whole line' behavior of --line-regexp.  Get
rid of --quiet to see that.

That does seem like a bug in the cygwin implementation of grep to me.

As a workaround for this simple example, you can add -a (aka --text)
to force it to treat the input as text.

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