[ubuntu-in] List Of Installed Software

[Hardik Dalwadi]

On Friday 18 June 2010 12:07 PM, Abhishek Amberkar [अभिषेक] wrote:
> On Fri, Jun 18, 2010 at 11:32 AM, Ramnarayan.K<ramnarayan.k at gmail.com>  wrote:
>> 2010/6/18 Abhishek Amberkar [अभिषेक]<abhishek.amberkar at gmail.com>:
>>>> dpkg --get-selections | awk '{print "sleep 0.5&&  echo" " "$1}' | bash
>>>>
>>>>
>>>
>>> Above command lists the packages which are marked "deinstall"
>>>
>>> As `man dpkg' says "deinstall" means
>>> The package is selected for deinstallation (i.e. we want to remove all
>>> files, except configuration files).
>>
>> not sure what you mean - cannot see deinstall mentioned anywhere in the command
>>>
>>> Following command gives list of all installed pacakges
>>>
>>> dpkg -l | grep ^i | awk '{print $2}'
>>
>> Did a comparision of the results of both commands
>>
>> the first gives me 3055 packages and the second 3084.
>>
>> about 29 packages more in the latter
>>
>> so why this difference and what does the deinstall mean ??
>>
>
> I already gave the meaning of "deinstall" in my previous posting.
> (Refer `man dpkg')
>
> If you do "$ dpkg --get-selections | grep deinstall" it shows
> "deinstall" packages. If you check state of any of these packages
> using "aptitude show<package_name>" it will show "not installed". So
> this command doesn't really shows all the `currently' installed
> packages on your system.

Also,

In other word, deinstall == "package was not removed with purge flag." 
Deinstall is similar to "rc" flag in `dpkg -l` Also, `dpkg 
--get-selections` is giving *state* of the packages (Hold, Purge, 
Deinstall, Install), so it's not good idea to get installed software 
(Package) list from it. `dpkg -l | grep "^ii"` would be better if you 
would like to use in administration, automation script, etc. +1 to Abhishek.

Also, if you want to remove deinstall (rc) packages, you have to purge 
it separately. Again, you can not use "apt-get remove --purge" command 
to purge packages. `dpkg -P package_name` would be your friend. If you 
have bunch of packages, then here is one liner for the same:

+++
dpkg -l | grep "^rc" | cut -f3 -d' '|xargs dpkg -P
+++

[FYI]
If you want it for end user, i would suggest to use synaptic package 
manager:

Go to -> System -> Administration -> Select "Synaptic Package Manager" 
(SPM).  At bottom part of windows you will find  number of installed 
packages. For detail information. You will find rectangle buttons @ left 
lower corner of SPM, select  "Status" to know installed package 
statistics. Here is image for further information [1].

[1] http://people.canonical.com/~hardik/How-to/Ubuntu_Package_Statistics.png

:wq
-- 
Hardik Dalwadi