grep

[W. B. Maguire II]

Hello:

First of all, *thanks* for all the great GNU software!

Unexpected behavior using 'grep' with the '-f' and '-P' options:

[Steps to recreate:]
--------------------

1) Create a file to search:

   $ cat > target.txt
   a
   b
   c
   d
   e
   f
   g
   h
   i
   gnu is great
   x
   y
   z
   ^D


2) Create a file containing the patterns for which to search:

   $ cat > patterns.txt
   a
   g
   y
   ^D


3) Grep with *NO* "--perl-regexp" works as expected:

   $ GREP_OPTIONS="" grep -f patterns.txt target.txt
   a
   g
   gnu is great
   y


4) Grep *WITH* "--perl-regexp" _does_not_work_:

   $ GREP_OPTIONS="" grep -P -f patterns.txt target.txt

   [exits with a value of "1"]


5) And *I* found it because grep was failing with my
   "$GREP_OPTIONS" environment variable setting:

   $ GREP_OPTIONS="--perl-regexp" grep -f patterns.txt target.txt

   [exits with a value of "1"]


I didn't see this behavior mentioned anywhere; I hope I'm not
doing anything dumb, but I can't see it, if so...  Could you
please respond either way, so that I know that this was read?

Thanks!
Bruce.

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