Have you heard of Tiddlywiki [0] (also mentioned above [1])? Although not command line, it is a single file and supports exporting/importing your notes as json,

Have you heard of Tiddlywiki [0] (also mentioned above [1])? Although not command line, it is a single file and supports exporting/importing your notes as json, and offers a lot of flexibility [0] https://tiddlywiki.com https://tiddlywiki.com [1] https://news.ycombinator.com/item?id=25804473 https://news.ycombinator.com/item?id=25804473