linux - Wait until process is killed to launch another process -

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this question has answer here:

i have no experience writting sh/bash script linux, want check if process running. if process running wait, when process killed execute proccess, (pseudo-code):

while main_process.run = true {     do_nothing; } execute new_process

how can in small script.sh? thanks!

if shell did start process waiting for, then:

wait <process id> execute_new_process

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