taskwarrior
Command-line todo list manager
It maintains a list of tasks that you want to do, allowing you to add/remove, and otherwise manipulate them. Task has a rich list of subcommands that allow you to do sophisticated things with it. You'll find it has customizable reports, charts, GTD features, Lua extensions, device synching and more. Taskwarrior is a very active project involving people around the globe - check often for updates.
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