How to obtain list of installed packages

[Dave Stevens]

Quoting Tom H <tomh0665 at gmail.com>:

> On Wed, May 11, 2016 at 6:58 PM, Bret Busby <bret.busby at gmail.com> wrote:
>> On 11/05/2016, Tom H <tomh0665 at gmail.com> wrote:
>>> On Wed, May 11, 2016 at 2:05 PM, Bret Busby <bret.busby at gmail.com> wrote:
>>>> On 11/05/2016, Tom H <tomh0665 at gmail.com> wrote:
>>>>> On Wed, May 11, 2016 at 12:47 PM, Ralf Mardorf <silver.bullet at zoho.com>
>>>>> wrote:
>>>>>> On Wed, 11 May 2016 12:06:29 +0200, Tom H wrote:
>>>>>>>
>>>>>>> The best answer's the one that proposed an aptitude search because it
>>>>>>> returned the list of packages that were installed specifically rather
>>>>>>> than automatically.
>>>>>>
>>>>>> this isn't a good advice.
>>>>>>
>>>>>> A pitfall could be that some packages are installed with the
>>>>>> recommended packages, but others were not installed with recommended
>>>>>> packages. This is important even when installing the same Ubuntu
>>>>>> release and fails when following your advice Tom.
>>>>>
>>>>> Not at all.
>>>>>
>>>>> You can run "aptitude -F %p search '?narrow(?installed,!?automatic)'"
>>>>> (or "aptitude -F %p search '~S ~i !~M'") to get the list of packages
>>>>> that were installed manually.
>>>>
>>>> Ah, no.
>>>>
>>>> Because, after I installed aptitude (it was not installed, when I
>>>> first tried to run the command), and, again ran that command, as
>>>> shown, it listed all kinds of packages that I had no knowledge of
>>>> installing.
>>>
>>> Don't be ridiculous!
>>>
>>> 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.)
>>>
>>
>> That has absolutely nothing to do with the topic.
>>
>> The last paragraph of the post to which I had replied, above, is
>> completely misleading.
>>
>> "
>>>>> You can run "aptitude -F %p search '?narrow(?installed,!?automatic)'"
>>>>> (or "aptitude -F %p search '~S ~i !~M'") to get the list of packages
>>>>> that were installed manually.
>> "
>>
>> That is absolute rubbish.
>>
>> The packages that you named specifically;
>>
>> "
>>> Don't be ridiculous!
>>>
>>> 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.)
>> "
>>
>> WERE NOT MANUALLY INSTALLED!!!!!!!!!!!!!!!!!!!!!!
>>
>> "
>> "
>>>>> You can run "aptitude -F %p search '?narrow(?installed,!?automatic)'"
>>>>> (or "aptitude -F %p search '~S ~i !~M'") to get the list of packages
>>>>> that were installed manually.
>> "
>> "
>>
>> Why do you not try to be helpful, instead of setting out to be nasty
>> and deliberately wasting people's time with your nastiness?
>
> Your understanding and skills are lacking. So you should ask for help
> rather than say "it doesn't work."
>
> Assume that you have two systems, A and B, both installed from an
> Ubuntu desktop iso.
>
> You then install, manually and over the course of a week or two, 100
> packages on A that pull in another 500 dependencies and you'd like to
> install the same packages on B.
>
> You run "aptitude -F %p search '?narrow(?installed,!?automatic)'" on A
> to get the list of all manually installed packages, by you or the
> installer.
>
> You then install that list of packages on B. Those that aren't
> installed will be installed and those already installed will not.

So about the re installation, could that be automated to avoid the week or so?

D

>
> An example of installing an already installed (and up-to-date) package:
>
> # apt-get install apt
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> apt is already the newest version (1.2.10ubuntu1).
> 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
>
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