Our scripts and tools work similarly on the four Unix systems we have in-house. Are you saying that it's OK that they don't work on Linux? Please do not forget

Our scripts and tools work similarly on the four Unix systems we have in-house. Are you saying that it's OK that they don't work on Linux? Please do not forget that Linux is a POSIX system, basically a re-implementation of Unix, and until systemd it's been a fully compliant -nix system. Where I work we have transparently been able to deploy our products on all -nix, including Linux, since the nineties. EDIT: My reply was supposed to be to xyzzys's post below, not the one I apparently replied to.. sorry about that.