todoman(1) on Linux
The text 93274ee47df4, as Debian 10 (Buster) shipped it.
Todoman Documentation Todoman is a simple, standards-based, cli todo (aka: task) manager. Todos are stored into icalendar files, which means you can sync them via CalDAV using, for example, vdirsyncer. Todoman is now part of the pimutils project, and is hosted at GitHub.