- To: slug@xxxxxxxxxxx
- Subject: Re: [SLUG] grep question
- From: "Amos Shapira" <amos.shapira@xxxxxxxxx>
- Date: Sun, 13 Apr 2008 21:55:13 +1000
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On Sun, Apr 13, 2008 at 9:41 AM, Alex Samad <alex@xxxxxxxxxxxx> wrote:
> > Try grep -Ev '^(\W*;|$)'
> great that works, (i changed to \s* instead, also tried the [[:space:]]
> and it worked)
>
> I don't understand hwy i need to test for ^$, I had thought that once a
> line test positive for ^\s*; it would be excluded ?
Because empty lines do not match the '^\W*;' part (they don't have a
';' in them to match the regular expression) and so grep prints them.
The '^$' part matches empty lines and so they are filtered out.
--Amos
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