The support from the community was awesome! As one of the first real Desktop oriented FreeBSD systems on the market, there was a ton of interest.
The permissions value are always 4 for read, 2 for write, 1 for execute. The three numbers are always for owner, group, and everybody on the system. Therefore 645 means: owner - read and write, group - read only, everybody - read and execute. You’ll rarely see such a permission set, but for interview question it might just work.
Those are application specific and therefore are not defined on the OS level.
SIGTERM asks the application to terminate in a polite way, it warns about the pending closure and asks the app to finish whatever it is doing. SIGKILL will kill the process no matter what. This is telling the application that it will be shut down no matter what.
% chsh -s /usr/local/bin/bash
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