How to obtain list of installed packages

[Ralf Mardorf]

On Wed, 11 May 2016 16:36:48 +0200, Tom H wrote:
>Did you install "apt"? Isn't it installed?
>
>How about "acl", "adduser", "anacron", "apparmor", "apport", ...? (And
>these are the As that I can remember off-hand.)

Hi Tom,

I can't speak for Bret, but you might be surprised about my install.

[root at archlinux moonstudio]# systemd-nspawn -q dpkg -l apt aptitude acl adduser anacron apparmor apport 
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  acl            2.2.52-2     amd64        Access control list utilities
ii  adduser        3.113+nmu3ub all          add and remove users and groups
un  anacron        <none>       <none>       (no description available)
un  apparmor       <none>       <none>       (no description available)
ii  apt            1.0.10.2ubun amd64        commandline package manager
ii  aptitude       0.7.3-1ubunt amd64        terminal-based package manager
dpkg-query: no packages found matching apport
[root at archlinux moonstudio]#

Regards,
Ralf