Re: Bug or feature?

[Eric Cloninger]

Here's what I've got:

Bug not present:
grep-2.5.3-6.fc12.x86_64
grep-2.6.3-1.fc12.x86_64

Bug present:
grep-2.5.1-54.2.el5
grep-2.5.1-55.el5
grep-2.5.1-57.fc7


----- Original Message -----
From: "Eric Blake" <address@hidden>
To: "Eric Cloninger" <address@hidden>
Cc: address@hidden
Sent: Wednesday, June 22, 2011 5:43:20 PM
Subject: Re: Bug or feature?

On 06/22/2011 04:25 PM, Eric Cloninger wrote:
> # echo " 1 2 3 4" |grep -o "^ [0-9]"
>  1
>  2
>  3
>  4
> 
> It would appear that -o chops up the input stream into a new line every time 
> a match is found.  However, I expect a "^...." grep to find only one result 
> per line of input, regardless of the return method (whole line or 
> only-matching).  Bug or feature?

Which version of grep?

$ echo " 1 2 3 4" | grep -o '^ [0-9]'
 1
$ grep (GNU grep) 2.8

and likewise for 2.9.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org