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I'm exploring working with the ubuntu terminal. For particular reason I need to check if I have installed Python interpreter, like cPython. How to do it? In general, how to check if some program is already installed and its version?

user3597222
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3 Answers3

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You can get a list of all installed packages with

dpkg --get-selections

to get more info about a package try 

dpkg -s <PACKAGENAME>
Ruediger
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You can try these.

By which

which <packagename>

Example: which firefox

Correct Result: /usr/bin/firefox

By dpkg

dpkg -l | grep <packagename>

Example: dpkg -l | grep firefox

Correct Result: ii firefox 22.0+build2-0ubuntu0.12.04.2 Safe and easy web browser from Mozilla

Illustration

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Community
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Ade Malsasa Akbar
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To know the version of an installed package just use the dpkg-query command:

$ dpkg-query -W foo
dpkg-query: no packages found matching foo
$ dpkg-query -W unity
unity   7.2.0+14.04.20140423-0ubuntu1.2
Sylvain Pineau
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