Bash - Exit parent script from child script

Question

I have a Bash parent script that on unexpected input calls an error logging child script that logs the error. I also want the execution to halt when the error occurs and th

Answer 1

Extension to @anishsane comment because MacOS has little bit different ps syntax.

Finding parent process ID (ppid) in child script under Mac OS (Darwin):

kill -SIGUSR1 $(ps $$ -o ppid=);exit