With rabbits, a common myth is that if you touch a baby rabbit the mother will no longer care for it. 9 times out of 10, the mother will return to care for the babies after they have been handled.
QNX is not a Linux distribution, normal or otherwise. QNX is POSIX compliant. That means that much of the programming interface and many of the utilities are the same. The underlying OS is very different in structure. There is little compatibility for drivers. With Linux the operating system functions as a very large monolithic piece of code.
Rational Developer for z/OS: A New Paradigm for Mainframe Development. by Prasad Ganti in Enterprise Tech Journal on December 3, 2012. Rational Developer for z/OS (RDz) is an Integrated Development Environment (IDE) for mainframe developers. A Graphical User Interface (GUI)-based tool that runs on the PC, it helps mainframe developers connect to the mainframe and most of the analysis and development work they normally do in the ISPF/TSO environment through a 3270 emulator.