问题
Will rc.local wait for each command to finish, or the commands are executed like exec() ?
回答1:
It's a normal shell script. So they block or not, according to how the script invokes the commands (e.g. with/without &).
But exec also works differently to how you appear to think; exec() doesn't do anything asynchronously.
回答2:
They block. They can be run asynchronously by putting '&' at the end.
来源：https://stackoverflow.com/questions/10790465/will-rc-local-block-until-command-finish-execution