Re: Altered behaviour of grep

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Mar 24 08:07, Fergus Daly wrote:
> grep -Pl "\xmn"
> used to find files containing the ASCII character mn. For instance
> grep -PL "\x0d" or "\x0a" or usefully "\x00".
> This seems to have been lost with the current version.
> Is this an error? If not, can anybody tell me what new syntax will recover the old behaviour?

I just tested this on Cygwin and Fedora 21, both with grep 2.21:

  $ cat x.sh
  #!/bin/sh
  echo ${0##*/}
  $ grep -Pl '\x30' x.sh
  x.sh
  $ grep -Pl '\x0a' x.sh
  $ 

Same result on both systems, so it finds characters in lines, but not
the line separator itself.  If that worked before, this looks like an
upstream change to me.

A bit of digging shows this thread on the bug-grep mailing list:
http://lists.gnu.org/archive/html/bug-grep/2015-03/msg00015.html

And indeed, if I add a NUL byte to the file and search for it:

 $ grep -Pl '\x0' x.sh
 $ grep -aPl '\x0' x.sh
 x.sh

This does not work for the CR or LF, though.  You may want to discuss
this on the bug-grep ML.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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