Mash is a shell for Unix and Unix-like operating systems. It's currently not 100% feature-complete and may have some bugs.
You can install by running the following command:
curl https://maxwellj.xyz/mash/install.sh | sudo bash
See the code and more detailed documentation on my Gitea server and discuss on Mattermost
So far, Mash is still very much an alpha, purely for testing. I'll probably update it in future with essential features.