On Thu, 2007-02-08 at 23:49 +0100, Bernard wrote: > Hi there ! > > Newcomer on Debian (former user of RedHat 7.2), I find the Debian packages > kind of hard to manage. With RedHat "rpm", I could find very easily > whether a package was installed or not, what was the version number etc.. > With Debian, I have not yet found the way to go ; I suppose that I should > read a greater number of pages, but there is so much doc that it is not > easy to find the right one right away. > > #apt-cache search package_name > > gives me some information on said package, but not the version number. In > fact, I suspect that this command does not read in my local base, but in > the distant servers, so that I don't know if a given package is being > installed on my system or not. > > For instance : > > #apt-cache search hplip
This will give you info on the package before it is even installed:
apt-cache show hplip
> My first question will be :
>
> How to check whether hplip (or any other package) is installed on my
> system or not ?
dpkg -l hplip
> The second question : how to investigate what packages are installed in my
> system, with all informations (package name, version etc...)
dpkg -l packagename
Or if you want to see what is installed period (from the command line)
dpkg -l | less
If you want to list the files installed:
dpkg -L packagename
for pretty GUI stuff:
synaptic
Cheers.
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