Watched an excellent short talk about eshell by @howard last night.
https://emacsconf.org/2022/talks/eshell/
Two things really stood out to me:
1. Piping to Emacs buffers with > #<buffer-name>
2. Virtual devices, e.g., piping to /dev/diary to trigger a certain Elisp function that does TheRightThingโข.