> 2) Check the parent process id being 1 > In this case parent of the parent because of mysqld_safe > # test $(ps -o ppid= -p $(ps -o ppid= -p $PID)) -eq 1 > This would work in most cases I can think of. mysqld run by a user > or a container would not be started by the init. But seems like a > rather complex solution to a fairly simple problem.
Option 2 seems OK. Alternatively we could check processed owned by user 'mysql'. Yes, the solution might be a bit complex, but I am fine with it as long as the bash code is well documented and as clean as possible, so that potential regressions/bugs in future are easy to track down and new people are confident in tweaking the code. Try avoiding long oneliners and short-cut code style (to the extend possible, it is after all bash scripting).
