On Sat, 2005-12-24 at 11:58 -0800, J.A. wrote:
> Any regex containing ! or | operators seem to get
> interpreted by bash as a bash operator. This could
> be avoided by putting the regex into a (perl?) file
> but then I would have to memorize a bunch of stupid
> little file scripts or create a stupid little file
> containing the script every time.
> 
> Here is one little example that doesn't work:
> 
> # Filter everything except lines containing
> # token1 or token2
> locate something | grep token1|token2
> 
> # Do not display lines with token3:
> locate something | grep !token3
> 
> grep has a -v option which is the same as a regex
> !token3 but I can't figure out how to then get grep
> to recognize inverting more than one token such as
> !(token3|token4).

! and | are bash operators, you need to escape them unless they are
inside single-quotes. IIRC double quotes are interpeted by most shells,
and single quotes arn't.

# whatever | egrep 'token1|token2' 
or # whatever |egrep token1\|token2

# whatever | grep \!token
or # whatever |grep '!token'

I like egrep over grep. I like regexp.

-Lares

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