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Re: grep: show matching line from pattern file

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On Sun 29 May 2022 at 15:02:35 (+0200), Jörg-Volker Peetz wrote:
> Jim Popovitch wrote on 28/05/2022 21:40:
> > Not exactly Debian specific, but hoping that someone here can help.
> > 
> > I have a file of regex patterns and I use grep like so:
> > 
> >     ~$ grep -f patterns.txt /var/log/syslog
> > 
> > What I'd like to get is a listing of all lines, specifically the line
> > numbers of the regexps in patterns.txt, that match entries in
> > /var/log/syslog.   Is there a way to do this?
> 
> How about this:
> 
> $ grep -of patterns.txt /var/log/syslog.1 | grep -n -f - patterns.txt

That will only work for literal patterns, not regex ones.

Cheers,
David.

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grep: show matching line from pattern file Jim Popovitch <jim@k4vqc.com> - 2022-05-28 22:00 +0200
  Re: grep: show matching line from pattern file The Wanderer <wanderer@fastmail.fm> - 2022-05-28 22:10 +0200
    Re: grep: show matching line from pattern file Greg Wooledge <greg@wooledge.org> - 2022-05-28 23:20 +0200
      Re: grep: show matching line from pattern file The Wanderer <wanderer@fastmail.fm> - 2022-05-28 23:30 +0200
      Re: grep: show matching line from pattern file Jim Popovitch <jim@k4vqc.com> - 2022-05-29 19:50 +0200
      Re: grep: show matching line from pattern file Will Mengarini <seldon@eskimo.com> - 2022-06-03 00:30 +0200
        Re: grep: show matching line from pattern file David Christensen <dpchrist@holgerdanske.com> - 2022-06-03 01:00 +0200
          Re: grep: show matching line from pattern file Will Mengarini <seldon@eskimo.com> - 2022-06-03 02:20 +0200
  Re: grep: show matching line from pattern file Jörg-Volker Peetz <jvpeetz@web.de> - 2022-05-29 15:10 +0200
    Re: grep: show matching line from pattern file David Wright <deblis@lionunicorn.co.uk> - 2022-05-29 15:50 +0200
      Re: grep: show matching line from pattern file duh <fill_in_the_blanks@email.com> - 2022-06-02 21:20 +0200
        Re: grep: show matching line from pattern file Greg Wooledge <greg@wooledge.org> - 2022-06-02 21:20 +0200
          Re: grep: show matching line from pattern file Richard Hector <richard@walnut.gen.nz> - 2022-06-04 05:00 +0200

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