repl.it's jobs page[1] is basically a bash terminal running on the web. You navigate it by using standard commands like cd and ls, and read files with cat, more or similar. This is NOT a bash emulator, this is an actual bash, running in a Docker container somewhere. repl.it lets you build an app, in almost any language, on the web, and run it. If it's a console app using stdin/stdout, they even provide you with a terminal emulator. Well, that's some pretty impressive instance of dogfooding.

[1] https://repl.it/jobs