apt-cache

Debian and Ubuntu package query tool. More information: https://manpages.debian.org/latest/apt/apt-cache.8.html.

Search for a package in your current sources:

apt-cache search {{query}}

Show information about a package:

apt-cache show {{package}}

Show whether a package is installed and up to date:

apt-cache policy {{package}}

Show dependencies for a package:

apt-cache depends {{package}}

Show packages that depend on a particular package:

apt-cache rdepends {{package}}