dpkg-query

A tool that shows information about installed packages. More information: https://manpages.debian.org/latest/dpkg/dpkg-query.1.html.

• List all installed packages:
  dpkg-query --list
• List installed packages matching a pattern:
  dpkg-query --list '{{libc6*}}'
• List all files installed by a package:
  dpkg-query --listfiles {{libc6}}
• Show information about a package:
  dpkg-query --status {{libc6}}
• Search for packages that own files matching a pattern:
  dpkg-query --search {{/etc/ld.so.conf.d}}