Redis

Redis is an in-memory key-value database. See also: NoSQL.

$ sudo apt install redis-tools

By default, it runs on port 6379 🐲.

$ redis-cli [-h host] [-p port]
host:port> help             # list commands
host:port> info             # get information
host:port> keys *           # list keys
host:port> get some_key     # get some value
host:port> set key value    # set some value
host:port> del key          # delete a key