Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #248680

Re: grep: show matching line from pattern file

Show all headers | View raw

On Thu, Jun 02, 2022 at 03:12:23PM -0400, duh wrote:

> > > Jim Popovitch wrote on 28/05/2022 21:40:
> > > > 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?

> $cat -n /var/log/syslog | grep warn
> 
> and it found "warn" in the syslog file and provided line numbers. I have
> not used the -f option

You're getting the line numbers from the log file.  The OP wanted the line
numbers of the patterns in the -f pattern file.

Why?  I have no idea.  There is no standard option to do this, because
it's not a common requirement.  That's why I wrote one from scratch
in perl.

Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

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

csiph-web