command-not-found.com

Install any command on any operating system.

find

Find files or directories under the given directory tree, recursively.

lwp-request

Simple command-line HTTP client. Built with libwww-perl.

sqlite3

The command-line interface to SQLite 3, which is a self-contained file-based embedded SQL engine.

apt-get

Debian and Ubuntu package management utility. Search for packages using `apt-cache`.