Add this ish to your $PATH somewhere and just run it.
# To list open todos:
t
# To create a new todo:
t add "Adding a new todo"
t a "Shortcut for adding a new todo"
# To mark a todo as completed:
t complete <todo number>
t x <todo number>
t saves everything in ~/.todo if you want to manually edit it. It looks like the example below. Completed items are below the dividing line.
Buy Gob the Aztec Tomb
Polish the Sword of Destiny
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Hide money in the banana stand