The nice thing is that many, many shells implement POSIX, so there is enormous portability.

Busybox bundles the Almquist shell, and there is a Windows port available. This is the easiest and least intrusive way to run shell scripts on Windows.

Busybox advertises that it bundles bash, but this is not true - it's Almquist with some added bashisms.

It also bundles their own awk implementation, but not Tcl/lua/lisp/scheme.