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Asked by aneesh

Is there any command to see whether the package is installed or not ?

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actionparsnip (andrew-woodhead666) said : 		#1

dpkg -l | grep packagename

if the line starts with

ii

it is installed

if you get no output or the first 2 characters are not 'ii' then it is not installed or has been installed then removed and the old config is still there (this will be evident with 'rc'). You can remove the rc lines with:

sudo dpkg -P packagename

This will remove the old configs, you can avoid this by using the '--purge' option when using apt-get. eg.

sudo apt-get --purge remove leafpad
instead of just
sudo apt-get remove leafpad

etc

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