>     That's a big mistake.

>     On any Debian system, /bin/sh points to /bin/dash, and dash
> doesn't point to bash. Your system has certainly been hacked.

>> It works!
>     Sure, bash can process ash scripts. The problem is the opposite
> isn't true because bash provides a lot of additional features,
> "bashisms", which distros decided to erradicate from their scripts.
> Users are free to write bash or ksh scripts, but portable scripts must
> execute on ash.

>     Didier