apt-cache

Debian and Ubuntu package query tool. More information: https://manned.org/apt-cache.8.

• 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