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Functions

Check the package is installed or not. There will show the package name which is installed.

Terminal - Check the package is installed or not. There will show the package name which is installed.
apt-show-versions | grep '\bpython\b'
2011-01-04 23:10:20
User: moonsilex
Functions: apt grep
0
Check the package is installed or not. There will show the package name which is installed.

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives
dpkg -l | cut -d' ' -f 3 | grep ^python$
2010-05-09 08:30:37
User: richard_ma
Functions: cut grep
Tags: grep dpkg cut
1

The ^python$ is a package name patten. You can change whatever you want.

dpkg -l python
2011-01-05 06:15:13
User: hackerb9
1

If the first two letters are "ii", then the package is installed. You can also use wildcards. For example,

.

dpkg -l openoffice*

.

Note that dpkg will usually not report packages which are available but uninstalled. If you want to see both which versions are installed and which versions are available, use this command instead:

.

apt-cache policy python

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