mksh

MirBSD Korn Shell - a POSIX-compliant Unix shell implementation

brewmacoslinux
Try with needOr install directly
Source

About

MirBSD Korn Shell

Commands

mksh

Examples

Start an interactive mksh shell session$ mksh
Execute a shell script with mksh$ mksh script.sh
Run a command directly without entering interactive mode$ mksh -c 'echo Hello from mksh'