I asked:
I wonder where the inspiration for the Unix job
control came from? In
particular, I can't help but notice that Control-Z does something very
similar in the PDP-10 Incompatible Timesharing System.
Jim Kulp answered:
The ITS capabilities were certainly part of the
inspiration. It was a
combination of frustrations and gaps in UNIX with some of those
features found in ITS that resulted in the final package of features.