murex is a shell, like bash / zsh / fish / etc. It follows a similar syntax to POSIX shells like Bash however supports more advanced features than you’d typically expect from a $SHELL.

It aims to be similar enough to traditional shells that you can retain most of your muscle memory, while not being afraid to make breaking changes where “bash-isms” lead to unreadable, hard to maintain, or unsafe code.

https://github.com/lmorg/murex

source: HN