Re: diff - Odd behavior of opton --ignore-matching-lines

Eli Zaretskii <[email protected]> Wed, 22 Feb 2012 21:53:37 +0200

Newsgroups	gmane.comp.gnu.utils.bugs
Message-ID	<[email protected]>

> From: Jari Aalto <[email protected]>
> Date: Wed, 22 Feb 2012 14:29:41 -0500
> 
> 
> Test under Bash:
> 
>     echo -e "1 2\n1" > a
>     echo -e "2 3\n4" > b
>     diff -u -I '2' a b
> 
>     =>
> 
>     -1 2
>     -1
>     +2 3
>     +4
> 
> Isn't --ignore-matching-lines supposed to ignore all lines matching REGEXP
> "2" above?

No.  From "diff --help":

  -I RE  --ignore-matching-lines=RE  Ignore changes whose lines all match RE.
                                                                ^^^