[alerighi]

For what I understand, this framework is compatible only with Bash, and not with other POSIX shells. Tipically on a router and other embedded platforms you find a minimal shell, like ash, that is POSIX-compatible but lacks of all the GNU extensions that Bash have and are used by this framework.

You find a full version of Bash only on GNU/Linux (not even in other UNIX OS like BSD), and there you can install the interpreter for the programming language of your choice