What is the meaning of $? in a shell script? - Unix & Linux Stack Exchange

Source:

https://unix.stackexchange.com/questions/7704/what-is-the-meaning-of-in-a-shell-script#:~:text=53-,%24%3F,status%20of%20the%20last%20command.

run_some_command  EXIT_STATUS=$?    if [ "$EXIT_STATUS" -eq "0" ]  then      # Do work when command exists on success  else      # Do work for when command has a failure exit  fi

#Alternatively:

if run_some_command  then      # Do work when command exists on success  else      # Do failure exit work  fi