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Groups > linux.debian.user > #256674

apt colored output (was Re: Buster => Bullseye: packages kept back)

From davidson <davidson@freevolt.org>
Newsgroups linux.debian.user
Subject apt colored output (was Re: Buster => Bullseye: packages kept back)
Date 2023-04-03 08:00 +0200
Message-ID <Gglot-h0dw-3@gated-at.bofh.it> (permalink)
References (3 earlier) <GdTcZ-fr9O-3@gated-at.bofh.it> <GdTwm-frh1-1@gated-at.bofh.it> <GdULL-fsdy-3@gated-at.bofh.it> <GdVHP-fsOD-3@gated-at.bofh.it> <Geb0d-fCge-1@gated-at.bofh.it>
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On Tue, 28 Mar 2023 davidson wrote:

Replying to myself.

> According to [console_codes(4), under section ECMA-48 Set Graphics
> Rendition], [this value] sets "blink off"
>
> # apt -o "APT::Color::Highlight=^[[25m" search nethack
>
> For me, this produces text in the default style (no highlights, no
> colors).

This surprised me.

But it should not have, since the config option specified above just
tells apt to prefix the package name with a different PRETTIFY escape
sequence in output like

   <PRETTIFY>slashem-x11<RESET ATTRIBS>/stable 0.0.7E7F3-10 amd64
     variant of Nethack (X11 window port)

One that happens to set the blink display attribute off. Vacuously, of
course, unless you happen to have "blink on" set.

Might as well replace 25 ("blink off") with any of

   22        set normal intensity
   24        underline off
   25        blink off
   27        reverse video off

or just

   0         reset all attributes to their defaults

or nothing at all, ie

  APT::Color::Highlight=^[[m

which is equivalent to

  APT::Color::Highlight=^[[0m # reset all attributes to their defaults

This solves the problem of undesired colors, but not the emission of
unwanted escape sequences. And so there are bug reports like this:

   #1010806 - apt: Avoid color output on monochrome terminals
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1010806

-- 
"What is your pronoun?" he inquired. "I have no pronoun," I answered,
hoping I knew his meaning. "What is your cog?" "My cog?" "Your sur
noun." "I haven't got that either."
-- Flann O'Brien, _The Third Policeman_

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Thread

Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-26 11:20 +0200
  Re: Buster => Bullseye: packages kept back Jeffrey Walton <noloader@gmail.com> - 2023-03-26 11:30 +0200
  Re: Buster => Bullseye: packages kept back davidson <davidson@freevolt.org> - 2023-03-26 13:20 +0200
    Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-26 15:00 +0200
      Re: Buster => Bullseye: packages kept back davidson <davidson@freevolt.org> - 2023-03-27 11:10 +0200
        Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-27 11:30 +0200
          Re: Buster => Bullseye: packages kept back David Wright <deblis@lionunicorn.co.uk> - 2023-03-27 16:50 +0200
          Re: Buster => Bullseye: packages kept back davidson <davidson@freevolt.org> - 2023-03-28 11:00 +0200
            Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-28 12:30 +0200
        Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-27 16:50 +0200
  Re: Buster => Bullseye: packages kept back Cindy Sue Causey <butterflybytes@gmail.com> - 2023-03-26 17:40 +0200
    Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-26 19:30 +0200
  Re: Buster => Bullseye: packages kept back David Wright <deblis@lionunicorn.co.uk> - 2023-03-26 20:20 +0200
    Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-27 00:30 +0200
  Re: Buster => Bullseye: packages kept back Jeffrey Walton <noloader@gmail.com> - 2023-03-26 23:20 +0200
    Re: Buster => Bullseye: packages kept back Jesper Dybdal <jd-debian-user@dybdal.dk> - 2023-03-27 00:30 +0200
      Re: Buster => Bullseye: packages kept back Vincent Lefevre <vincent@vinc17.net> - 2023-03-27 13:30 +0200
        Re: Buster => Bullseye: packages kept back Greg Wooledge <greg@wooledge.org> - 2023-03-27 13:50 +0200
          Re: Buster => Bullseye: packages kept back Vincent Lefevre <vincent@vinc17.net> - 2023-03-27 14:20 +0200
            Re: Buster => Bullseye: packages kept back Greg Wooledge <greg@wooledge.org> - 2023-03-27 14:30 +0200
          Re: Buster => Bullseye: packages kept back Dan Ritter <dsr@randomstring.org> - 2023-03-27 15:10 +0200
            Re: Buster => Bullseye: packages kept back Nicolas George <george@nsup.org> - 2023-03-27 15:20 +0200
              Re: Buster => Bullseye: packages kept back gene heskett <gheskett@shentel.net> - 2023-03-27 16:10 +0200
                Re: Buster => Bullseye: packages kept back <tomas@tuxteam.de> - 2023-03-27 17:40 +0200
                Re: Buster => Bullseye: packages kept back gene heskett <gheskett@shentel.net> - 2023-03-27 20:10 +0200
                Re: Buster => Bullseye: packages kept back <tomas@tuxteam.de> - 2023-03-28 07:10 +0200
                Re: Buster => Bullseye: packages kept back gene heskett <gheskett@shentel.net> - 2023-03-28 17:10 +0200
                alternative views of PNG (was Re: Buster => Bullseye: packages kept  back) davidson <davidson@freevolt.org> - 2023-03-28 13:00 +0200
                Re: alternative views of PNG (was Re: Buster => Bullseye: packages  keptback) gene heskett <gheskett@shentel.net> - 2023-03-28 17:40 +0200
                Re: alternative views of PNG (was Re: Buster => Bullseye: packages  keptback) gene heskett <gheskett@shentel.net> - 2023-03-28 18:50 +0200
                Re: alternative views of PNG (was Re: Buster => Bullseye: packages  keptback) <tomas@tuxteam.de> - 2023-03-28 20:00 +0200
                Re: alternative views of PNG (was Re: Buster => Bullseye: packages  keptback) <tomas@tuxteam.de> - 2023-03-28 20:00 +0200
                Re: alternative views of PNG (was Re: Buster => Bullseye: packages  keptback) davidson <davidson@freevolt.org> - 2023-03-29 09:30 +0200
              Re: Buster => Bullseye: packages kept back Vincent Lefevre <vincent@vinc17.net> - 2023-04-03 13:50 +0200
            Re: Buster => Bullseye: packages kept back Greg Wooledge <greg@wooledge.org> - 2023-03-27 16:10 +0200
              Re: Buster => Bullseye: packages kept back davidson <davidson@freevolt.org> - 2023-03-28 08:30 +0200
                apt colored output (was Re: Buster => Bullseye: packages kept  back) davidson <davidson@freevolt.org> - 2023-04-03 08:00 +0200
      Re: Buster => Bullseye: packages kept back Anssi Saari <as@sci.fi> - 2023-03-28 11:30 +0200

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