[debbugs-tracker] bug#21414: closed (-F string with tailing newline always matches )

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Your message dated Fri, 4 Sep 2015 10:34:12 -0700
with message-id <address@hidden>
and subject line Re: bug#21414: -F string with tailing newline always matches
has caused the debbugs.gnu.org bug report #21414,
regarding -F string with tailing newline always matches 
to be marked as done.

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21414: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21414
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--- Begin Message --- Subject: -F string with tailing newline always matches Date: Fri, 4 Sep 2015 14:45:45 +0000

Grep version 2.20

 

When using the ouput of another command to pass match strings into grep using –F I was getting unexpected results as it was matching every line. If the terminating newline is removed the grep started to work again.

 

Easy to work around but this is different behaviour from 2.12 and may cause some scripts to fail.

 

Ian Brown (HDS)

 

--- End Message ---

> --- Begin Message ---
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> Subject: 
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> Re: bug#21414: -F string with tailing newline always matches
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> Date: 
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> Fri, 4 Sep 2015 10:34:12 -0700
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0
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> On 09/04/2015 07:45 AM, Ian Brown - HNAS wrote:
> > Grep version 2.20
> >
> > When using the ouput of another command to pass match strings into grep using 
> > -F I was getting unexpected results as it was matching every line. If the 
> > terminating newline is removed the grep started to work again.
> >
> > Easy to work around but this is different behaviour from 2.12 and may cause 
> > some scripts to fail.
> >
> > Ian Brown (HDS)
>
> I assume you're referring to the following sort of behavior:
>
> $ printf 'abc\n\ndef\n' >foo
> $ grep -F 'abc
> ' foo
> abc
>
> def
>
> Older versions of GNU grep would ignore the newline after 'abc' in the 
> pattern, and would output only 'abc' with the above example. This 
> behavior was incompatible with non-GNU grep implementations and with 
> POSIX, and the incompatibility seemed to be unintended and not that 
> useful and was fixed at some point (sorry, don't know the GNU grep 
> version).  Sorry you were relying on it.
>
>
> --- End Message ---