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The script todo.rb is a simple to-do list manager.

To use this tool, you add new tasks to the list via the “todo” command. You work the list in order; you can either mark the current task “done” or “skip” it. If you skip a task three times, it’s deleted; you’ll have to manually re-add it if you intend to do it. If you move past the end of the list, you go back to the first not-done task and start over. There are two other commands: “list” prints a list of all incomplete tasks, and “quit” exits the system (losing all data – we haven’t addressed persistence).

The shell script test.sh runs a couple of user sessions (*.in) with the tool, capturing their output and comparing it with the expected responses (*.master).