Help with package managers

[Andy Harrison]

On 4/10/07, Sean Maguire <maguiresf at googlemail.com> wrote:
> Hi all,
>
> Is it possible to use any of the package managers to find out which
> packages have been added since the initial installation? For instance,
> I have Ubuntu install on machine A and I want to do a second install
> on machine B. I like the package set install on machine A and want the
> same on machine B; can I generate a list so that I can "apt-get
> install <list>" and have all the packages from machine A installed on
> machine B?
>
> Even better would be a way to keep them synchronized, so I install a
> package on either machine and the other would detect this and prompt
> me to install said package. I guess if it is possible to generate the
> list I could get a perl script together to do this.
>
> Cheers for your help,
>
> Sean
>
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I don't know if any of the package managers can do this, but you can
just look in the /var/cache/apt/archives directory.  This is where all
the packages you've installed reside.

So perhaps you could sync the directory with the other machine and
then install the deb files that weren't already present.  Just keep in
mind that when you upgrade one of these packages, it doesn't remove
the old deb file of the corresponding version.

-- 
Andy Harrison