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Re: how to view config file changes without running an upgrade?

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On 2018-03-21, The Wanderer <wanderer@fastmail.fm> wrote:
>
>> Hi folks,
>>=20
>> How can I view the diffs between my local modified config file (maybe
>> modified 2 years ago) and the maintainer's config file included in
>> the currently installed package or in a pending package upgrade? I
>> would like to review my diffs, before running "apt upgrade".
>
> In my experience, when (what I think Debian officially calls) a conffile
> has been locally modified, the upgrade process (by default) halts and
> presents a prompt asking the user what to do; the options include "show
> a diff of the contents", "background the install so other actions can be
> taken", "keep the locally-modified version", and "replace the local
> version with the package's version". I think there's an apt config
> option to affect this, but I don't know what it is or exactly where to
> find out.
>

It looks like this:

Configuration file `/etc/dhcp/dhclient.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** dhclient.conf (Y/I/N/O/D/Z) [default=N] ?

man dpkg (confmiss, confnew, confold, confdef, confask). 
      
So with apt you can presumably do something like:

 apt-get -o Dpkg::Options::="--force-confold" -dist-upgrade

(Which would preserve the user-modified conffile with prompting.)

-- 
Bah, the latest news, the latest news is not the last.
Samuel Beckett

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how to view config file changes without running an upgrade? Harald Dunkel <harald.dunkel@aixigo.de> - 2018-03-21 09:20 +0100
  Re: how to view config file changes without running an upgrade? The Wanderer <wanderer@fastmail.fm> - 2018-03-21 12:50 +0100
    Re: how to view config file changes without running an upgrade? rhkramer@gmail.com - 2018-03-21 13:30 +0100
      Re: how to view config file changes without running an upgrade? Hans <hans.ullrich@loop.de> - 2018-03-21 14:30 +0100
    Re: how to view config file changes without running an upgrade? Curt <curty@free.fr> - 2018-03-21 14:50 +0100
      Re: how to view config file changes without running an upgrade? Curt <curty@free.fr> - 2018-03-21 15:20 +0100
        Re: how to view config file changes without running an upgrade? Cindy-Sue Causey <butterflybytes@gmail.com> - 2018-03-21 16:40 +0100
          Re: how to view config file changes without running an upgrade? deloptes <deloptes@gmail.com> - 2018-03-21 22:00 +0100
            Re: how to view config file changes without running an upgrade? Richard Hector <richard@walnut.gen.nz> - 2018-03-21 22:40 +0100
              Re: how to view config file changes without running an upgrade? deloptes <deloptes@gmail.com> - 2018-03-21 22:50 +0100
                Re: how to view config file changes without running an upgrade? Curt <curty@free.fr> - 2018-03-22 11:20 +0100
                Re: how to view config file changes without running an upgrade? felmon davis <moelmoel2714@gmail.com> - 2018-03-27 09:00 +0200
                Re: how to view config file changes without running an upgrade? Curt <curty@free.fr> - 2018-03-27 09:30 +0200
            Re: how to view config file changes without running an upgrade? Jason <electron@emypeople.net> - 2018-03-22 03:30 +0100
    Re: how to view config file changes without running an upgrade? Harald Dunkel <harald.dunkel@aixigo.de> - 2018-03-21 16:50 +0100
      Re: how to view config file changes without running an upgrade? Greg Wooledge <wooledg@eeg.ccf.org> - 2018-03-21 17:20 +0100
        Re: how to view config file changes without running an upgrade? deloptes <deloptes@gmail.com> - 2018-03-21 22:00 +0100
        Re: how to view config file changes without running an upgrade? Harald Dunkel <harald.dunkel@aixigo.de> - 2018-03-22 11:20 +0100
          Re: how to view config file changes without running an upgrade? Tomaž Šolc <tomaz.solc@tablix.org> - 2018-03-23 10:20 +0100
  Re: how to view config file changes without running an upgrade? David Wright <deblis@lionunicorn.co.uk> - 2018-03-21 16:00 +0100
    Re: how to view config file changes without running an upgrade? Greg Wooledge <wooledg@eeg.ccf.org> - 2018-03-21 16:20 +0100
      Re: how to view config file changes without running an upgrade? David Wright <deblis@lionunicorn.co.uk> - 2018-03-21 18:20 +0100
    Re: how to view config file changes without running an upgrade? <tomas@tuxteam.de> - 2018-03-21 16:20 +0100
  Re: how to view config file changes without running an upgrade? Harald Dunkel <harald.dunkel@aixigo.de> - 2018-03-21 17:00 +0100

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