What about using sudo?

As root, create the script, “chmod u+s script” it.

I’ve read that many current UNIXes ignore suid bit on scripts.
I hoped that QNX4 does this too.

XTang, which version does your advise relate to?

Yes, “current UNIXes”. Neither QNX 4 nor QNX 6 is considered that :slight_smile:
So, setuid script will work.