Tuesday, December 18, 2007

When I start to reading Ubuntu packaging guide, I found this interesting things which can do using apt and dpkg.

  • apt-cache dump : lists every package in the cache. This command is especially helpful in combination with a grep pipe such as apt-cache dump | grep foo to search for packages whose names or dependencies include foo.
  • apt-cache policy : lists the repositories (main/restricted/universe/multiverse) in which a package exists.
  • apt-cache show : displays information about a binary package.
  • apt-cache showsrc : displays information about a source package.
  • apt-cache rdepends : shows reverse dependencies for a package (which packages require the queried one.
  • dpkg -S : lists the binary package to which a particular file belongs.
  • dpkg -l : lists currently installed packages. This is similar to apt-cache dump but for installed packages.
  • dpkg -c : lists the contents of a binary package. It is useful for ensuring that files are installed to the right places.
  • dpkg -f : shows the control file for a binary package. It is useful for ensuring that the dependencies are correct.
  • grep-dctrl : searches for specialized information in packages. It is a specific use of the grep package (but not installed by default).