https://github.com/acmesh-official/acme.sh
GitHub - acmesh-official/acme.sh: A pure Unix shell script ACME client for SSL / TLS certificate...
A pure Unix shell script ACME client for SSL / TLS certificate automation - acmesh-official/acme.sh
unix shellgithubofficialacmepure
https://drewdevault.com/blog/A-new-shell-for-Unix/
rc: a new shell for Unix
a newrcshellunix