This replaces the currently running process with the new one using `exec` instead of creating a new process. This way, when the user `exit`s out of the new shell it will not pop them back into the shell from which ohmyzsh was installed from.
This replaces the currently running process with the new one using `exec` instead of creating a new process. This way, when the user `exit`s out of the new shell it will not pop them back into the shell from which ohmyzsh was installed from.