Will rc.local block until command finish execution?

Question

Will rc.local wait for each command to finish, or the commands are executed like exec() ?

Answer 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.

Answer 2

They block. They can be run asynchronously by putting '&' at the end.