Emacs: Mastering Eshell
I'm a long-time vim user, but I like to program the parens-y languages, so tried my hand at emacs a while back.Somehow, over decades, I had never heard about this cross-platform shell built into emacs. There doesn't seem to be much fanfare about it (at least from an outsider's perspective), but having a consistent shell available on any platform emacs runs on is really cool.