From an industrial, commercial, and ‘mission critical’ standpoint unix like operating systems are extremely stable. At least before the early 2000’s, industrial type distributed control systems that used an OS have been based in unix type operating systems. Old school Westinghouse distributed processing hardware used Solaris which is unix like. These days windows can be found in industrial control environments but back in the day it would have been unix. Certain types of operating systems known as ‘real time operating systems’ are usually unix like. Redhawk linux is an example of a real time OS.
People like putting linux variants on their PC’s because it is open source and free to use as well as modify. Not all flavors of linux/unix are free though. Redhawk is definitely not free.
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