Commands:
-i|--install <.deb file name> ... | -R|--recursive <directory> ...
--unpack <.deb file name> ... | -R|--recursive <directory> ...
-A|--record-avail <.deb file name> ... | -R|--recursive <directory> ...
--configure <package> ... | -a|--pending
--triggers-only <package> ... | -a|--pending
-r|--remove <package> ... | -a|--pending
-P|--purge <package> ... | -a|--pending
-V|--verify <package> ... Verify the integrity of package(s).
--get-selections [<pattern> ...] Get list of selections to stdout.
--set-selections Set package selections from stdin.
--clear-selections Deselect every non-essential package.
--update-avail [<Packages-file>] Replace available packages info.
--merge-avail [<Packages-file>] Merge with info from file.
--clear-avail Erase existing available info.
--forget-old-unavail Forget uninstalled unavailable pkgs.
-s|--status <package> ... Display package status details.
-p|--print-avail <package> ... Display available version details.
-L|--listfiles <package> ... List files 'owned' by package(s).
-l|--list [<pattern> ...] List packages concisely.
-S|--search <pattern> ... Find package(s) owning file(s).
-C|--audit [<package> ...] Check for broken package(s).
--yet-to-unpack Print packages selected for installation.
--predep-package Print pre-dependencies to unpack.
--add-architecture <arch> Add <arch> to the list of architectures.
--remove-architecture <arch> Remove <arch> from the list of architectures.
--print-architecture Print dpkg architecture.
--print-foreign-architectures Print allowed foreign architectures.
--assert-<feature> Assert support for the specified feature.
--validate-<thing> <string> Validate a <thing>'s <string>.
--compare-versions <a> <op> <b> Compare version numbers - see below.
--force-help Show help on forcing.
-Dh|--debug=help Show help on debugging.
