How do I execute commands serially inside a shell script?

Question

I want to write a shell script to execute some commands in sequence (the next one starts only after the previous has finished and so on). I've never written a bash script before and I couldn't find the appropriate sequence.

I know that in the terminal you do things like yarn this && yarn that && yarn other and it works but I don't know the equivalent inside a shell script.

#!/bin/sh

direnv allow

# now wait for direnv allow to finish

direnv reload

# now wait for direnv reload to finish

yarn start:server

Answer 1

The shell will execute each command one after another serially as written. Servers often daemonize, i.e. fork() and have the parent return. They usually have -f flag to suppress that behavior, precisely because you may want that serial behavior.