Recovery will abort and the server will not start up upon any of the following:
the shell is unable to execute the command (due to it not being found or executable),
the command returns an exit status greater than 125, or a non-SIGTERM signal
terminates the shell process. SIGTERM allows a clean shutdown to happen, if there is one.
Mostly just changing the order a bit but goes from most immediate when making a change (bad command written into the GUC) to least immediate or surprising (SIGTERM). The other two flow from there.
I agree. I like this concise way to explain the different cases.
