Today I had to "do nothing" in bash. In python you have "pass" for this task. In C, you can use ";". I found this post from someone having the same issue. He proposes either "sleep 0" or "A=0". However, looks like this is even nicer: from the bash manual

: [arguments]

No effect; the command does nothing beyond expanding arguments and performing any specified redirections. A zero exit code is returned.

So, a simple ":" will do the trick.