Looks sweet will use. Some however might be happy with using existing command "pushd" to save there current working directory that is in almost every shell ever including dos! This does have more feachures but sometimes you have enough to work with the defaults (i.e. other people machines) too.

This is interesting! Reminds me of something I made for an operating systems course.

Mine was called ctags and allowed you to tag processes. First it was implemented as a lkm, then was reimplemented inside the kernel as an additional field in the process struct (forget what its called).

For macos I feel like https://github.com/jdberry/tag is probably a better solution.