View the original community article here
Last tested: Jul 3, 2018
Docs have a pretty simple example
LOOKERARGS="--no-ssl --port 8080"
Here's another example with more startup flags set:
LOOKERARGS="--cipher-key-file key-20160226-220142.key -d looker-db --use-custom-jdbc-config --concurrent-render-jobs=4"
As seen more clearly in the second example, all of the necessary startup flags go within the LOOKERARGS=" " variable.
The startup flags seen are documented here.