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Sometimes you wan't to know which files are in the package foo. To get this information enter the command Sometimes you want to know which files are in the package foo. To get this information enter the command

Contents of a debian file

To get the contents of the file "abc.deb", you have to enter

$ dpkg-deb -c abc.deb

Reconfiguring of debconf

To reconfigure debconf, so that it informs you of most changes of the new packages, you have to enter

# dpkg-reconfigure debconf

Chose "medium" here

Package Management with apt-get and dpkg

Package resource list for APT

The file /etc/apt/sources.list is the definition file of the sources for apt. For further information about this file type man 5 sources.list

Retrieve new lists of packages:

To fetch the new lists of all the packages from sources.list enter as ?RootUser

# apt-get update

This command checks for new release-files on the given servers. Luckily the command is clever enough to check if the release-file has changed after the last update.

Upgrade of all the files:

To make an update of all the changed packages, enter the line

# apt-get update -u

The additional flag -u shows a list of upgraded packages as well. If you want to run the update in a cron-job, you should use the flags -dy. With this flags the new packages will be downloaded but not installed. You can install them later by writing apt-get update -u.

Distribution Upgrade of all the files:

To make an upgrade of your actual distribution (e.g from potato to woody or when using unstable) replace upgrade with dist-upgrade when entering your command. So you have to type

apt-get dist-upgrade -dy

apt-get dist-upgrade -u

for an distribution upgrade.

Add a package:

How can you add a package to your system without the gui-programms? All you have to do is find out the name of this package and enter the command

apt-get install sylpheed-claws

to add the package sylpheed-claws.

Remove a package:

To get rid of the package foo which is no longer needed, enter the command

# apt-get remove foo

If the package is needed by other packages you will be prompted to remove this package and all packages which depend on it.

Forced removing of a package:

While making an distibution upgrade it coud happen that you have to remove a package first. But sometimes this is not possible with apt-get remove since the package has unmet dependencies or is not installed completely. You can remove the package foo by using the command

dpkg --force-all --remove foo

Read the contents of a installed package:

Sometimes you want to know which files are in the package foo. To get this information enter the command

dpkg -L foo

Get the description of a package:

You don't know what the package foo is for? Just write

dpkg -p foo

Search the package of a file:

Have you ever wondered to which package belongs a given file? To get this information (e.g. for /usr/bin/apt-get), start the command

dpkg -S /usr/bin/apt-get

and it will tell you that this file is part of the package apt.