/usr/bin/dpkg-query

Usage: dpkg-query [<option>...] <command>

Commands:
  -s, --status [<package>...]
          Show package metadata information.
  -W, --show [<pattern>...]
          Show package metadata information, with specified format.
  -l, --list [<pattern>...]
          List packages concisely.
  -L, --listfiles <package>...
          List files 'owned' by packages.
  -S, --search <pattern>...
          Find packages owning files.
  -p, --print-avail [<package>...]
          Show available package version information.
      --control-list <package>
          List the package metadata control files.
      --control-show <package> <file>
          Show the package metadata control file.
  -c, --control-path <package> [<file>]
          Print path for package control file.
  -?, --help
          Show this help message.
      --version
          Show the version.

Options:
  -f, --showformat=<format>
          Use alternative format for --show.
          [default: ${binary:Package}\t${Version}\n]
      --load-avail
          Use available file on --show and --list.
      --no-pager
          Disables the use of any pager.
      --admindir=<directory>
          Change the database directory.
          [default: /var/lib/dpkg]
          [env: DPKG_ADMINDIR=]
      --root=<directory>
          Change the root directory.
          [default: /]
          [env: DPKG_ROOT=]

Format syntax:
  A format is a string that will be output for each package. The format
  can include the standard escape sequences \n (newline), \r (carriage
  return) or \\ (plain backslash). Package information can be included
  by inserting variable references to package fields using the ${var[;width]}
  syntax. Fields will be right-aligned unless the width is negative in which
  case left alignment will be used.