Terminal commands for package management can be an essential thing if you come across an unexpected error or are just interested in how things work. Here are a few of the more important ones:

 

apt-cache search --names-only --installed

Followed by a pattern, the above command searches every package in its cache for it (you can leave or add the given options starting with --).

apt-cache showpkg

Followed by a package name, this command gives you basic information about it, e.g version number, dependencies...

apt-cache stats

This command gives basic statistics about your package cache.

apt-cache depends

Followed by a package name, this command gives you all of the package's dependencies.

apt-cache unmet

This command gives you a list of unmet dependencies.

cat /etc/apt/sources.list

Gives you a list of your repositories. The file can also be opened with a text editor to be edited.

ls /etc/apt/sources.list.d

Shows the contents of the given directory, where your installed ppa are stored in.

Useful apt commands (Ubuntu, Debian, Mint etc.)
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