Re: disable IPv6 debian

From	The Wanderer <wanderer@fastmail.fm>
Newsgroups	linux.debian.user
Subject	Re: disable IPv6 debian
Date	2022-04-16 03:50 +0200
Message-ID	<EcFJv-91D1-3@gated-at.bofh.it> (permalink)
References	(4 earlier) <EcvAt-8VxH-5@gated-at.bofh.it> <EcEaJ-90SX-3@gated-at.bofh.it> <EcEkp-90W9-7@gated-at.bofh.it> <EcEu5-90Zc-1@gated-at.bofh.it> <EcENr-915z-3@gated-at.bofh.it>
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On 2022-04-15 at 20:47, Greg Wooledge wrote:

> On Sat, Apr 16, 2022 at 08:20:40AM +0800, wilson wrote:

>> ps -efw |grep $PS |grep -v grep

> You're also going to exit your script with the exit status from that
> last grep command.  That's probably not what you want.  If it's not,
> then an explicit "exit 0" at the end might be a good idea.
> 
> Or, as another choice, you might want to exit with the exit status
> of the *first* grep.  In that case, switching them around would be
> better:
> 
> ps -efw | grep -v grep | grep "$PS"

This would probably result in undesired behavior. I recognize this
pattern; for reasons that I don't entirely grasp but which seem somehow
intuitive to me, invoking ps in any of the ways that I've yet found
useful and piping the output to grep will result in that grep process -
with its arguments - being listed in the ps output.

Because the string you're grepping for is included in that argument
list, that line will be matched, and so will be printed.

In order to avoid that, the obvious thing to do is just append ' | grep
-v grep' to the pipeline, so that the unwanted result line gets stripped
out. I've used that pattern many times.

IOW: Having the "cut out any lines that mention the command that got the
search pattern passed to it" command come last is likely to be a necessity.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

Thread

disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-15 13:50 +0200
  Re: disable IPv6 debian 황병희 <soyeomul@doraji.xyz> - 2022-04-15 14:00 +0200
    Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-15 14:30 +0200
      Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-15 17:00 +0200
        Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-15 18:00 +0200
          Re: disable IPv6 debian Tim Woodall <debianuser@woodall.me.uk> - 2022-04-15 18:10 +0200
        Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-16 02:10 +0200
          Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-16 02:20 +0200
            Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-16 02:30 +0200
              Re: disable IPv6 debian Charles Curley <charlescurley@charlescurley.com> - 2022-04-16 02:40 +0200
              Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-16 02:50 +0200
                Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-16 03:10 +0200
                Re: disable IPv6 debian The Wanderer <wanderer@fastmail.fm> - 2022-04-16 03:50 +0200
                Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-16 04:10 +0200
                Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-16 05:00 +0200
                Re: disable IPv6 debian The Wanderer <wanderer@fastmail.fm> - 2022-04-16 14:10 +0200
                Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-16 15:10 +0200
                Re: disable IPv6 debian David Wright <deblis@lionunicorn.co.uk> - 2022-04-16 18:10 +0200
                Re: disable IPv6 debian <tomas@tuxteam.de> - 2022-04-16 08:20 +0200
                Re: disable IPv6 debian Tim Woodall <debianuser@woodall.me.uk> - 2022-04-16 08:40 +0200
                Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-16 10:30 +0200
                Re: disable IPv6 debian David <bouncingcats@gmail.com> - 2022-04-16 10:50 +0200
                Re: disable IPv6 debian Greg Wooledge <greg@wooledge.org> - 2022-04-16 15:00 +0200
            Re: disable IPv6 debian Michael Stone <mstone@debian.org> - 2022-04-16 20:00 +0200
          Re: disable IPv6 debian <tomas@tuxteam.de> - 2022-04-16 08:20 +0200
      Re: disable IPv6 debian Chuck Zmudzinski <brchuckz@netscape.net> - 2022-04-15 19:40 +0200
      Re: disable IPv6 debian Andy Smith <andy@strugglers.net> - 2022-04-16 01:00 +0200
        Re: disable IPv6 debian didar <nosferatu@purlo.in> - 2022-04-16 07:10 +0200
          Re: disable IPv6 debian Andy Smith <andy@strugglers.net> - 2022-04-16 11:50 +0200
  Re: disable IPv6 debian Reco <recoverym4n@enotuniq.net> - 2022-04-15 14:30 +0200
    Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-15 14:40 +0200
      Re: disable IPv6 debian Erwan David <erwan@rail.eu.org> - 2022-04-15 16:00 +0200
        Re: disable IPv6 debian Jeremy Ardley <jeremy@ardley.org> - 2022-04-15 16:20 +0200
      Re: disable IPv6 debian Reco <recoverym4n@enotuniq.net> - 2022-04-15 16:20 +0200
  Re: disable IPv6 debian wilson <info@bigcount.xyz> - 2022-04-16 02:20 +0200
  Re: disable IPv6 debian Ash Joubert <ash@transient.nz> - 2022-04-16 02:20 +0200

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