Atuin replaces your existing shell history with a SQLite database, recording additional context for your commands. It also provides optional and fully encrypted synchronisation of your history between machines

Atuin @ GitHub.

a game to learn (or teach) how to use standard commands in a Unix shell.
Teaching first-year university students or high schoolers to use a Unix shell is not always the easiest or most entertaining of tasks. GameShell was devised as a tool to help students at the Université Savoie Mont Blanc to engage with a real shell, in a way that encourages learning while also having fun.