List all (installed) packages

export COLUMNS=10
dpkg -l "*"
dpkg -l "*" | grep ^ii

Download Source Package and Build It:

apt-get -b source foo

Build Source Package:

dpkg-source -x foo.dsc

Build Sources:

dpkg-buildpackage -rfakeroot

Search Package:

apt-cache search foo

Reinstall Packages with Missing Files:

for i in /var/lib/dpkg/info/*.list;
  while read line ;
    if [ ! -e "$line" ]; then echo "Reinstall $(basename $i) ($line)"; break; fi;
   done < "$i" ;

Which Is the Largest Package that would Be Upgraded:

apt-get upgrade --print-uris -y | awk '{ print $3" "$1" "$2 }' | grep '.*' | sort -n | tail -10

Build the Packages File:

dpkg-scanpackages ./ /dev/null | gzip > Packages.gz
apt-ftparchive ./ | gzip > Packages.gz

Build Kernel:

make-kpkg clean
make-kpkg          kernel_image --revision=Configname.Version
make-kpkg --initrd kernel_image

Poweroff after Shutdown:

echo "apm" >> /etc/modules
(search for realmode_power_off)

Build a Debian Package from the files of an already installed one:

dpkg-repack NAME

Remove a Package despite existing Dependencies:

dpkg -r --force-depends NAME

List Packages sorted by their origin:

Install and Remove init.d Links

Insert links for foobar using the defaults:

update-rc.d foobar defaults

Insert links for foobar at position 20 in runlevel 2,3,4,5,0,1,6

update-rc.d foobar start 20 2 3 4 5 . stop 20 0 1 6 .

Remove links for foobar

update-rc.d foobar remove

Choose your favourite application via the alternatives system

/usr/sbin/update-alternatives --list   editor
/usr/sbin/update-alternatives --set    editor /usr/bin/vim
/usr/sbin/update-alternatives --set    editor /usr/bin/emacs21

Build Nvidia Kernel Modul

module-assistant auto-install nvidia

Andrew's Debian-nVidia HOWTO

Debian add GPG key

Recently, Debian started to use secure apt. You might notice this with messages like this one

W: GPG error: http://... ... Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A080A41350959092
W: You may want to run apt-get update to correct these problems

You can then import the missing key, check it and add it with apt-key

# gpg --keyserver --recv-key A080A41350959092
gpg: requesting key 50959092 from hkp server
gpg: key 50959092: ... imported

# gpg -a --export 50959092 | apt-key add -