JSO1 successfully answered Rich Collins's question:

How do I restart things in the /Library/StartupItems directory? I have postgresql set to startup, but I want to restart instead of rebooting.

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Answers by: JSO1

JSO1's Answer:

Reply by JSO1 920 days ago

It depends on the script in the /Library/StartupItems and the name of the script in /Library/StartupItems

Let's presume the script to start PostgreSQL is called postgresql.

You should be able to do something like this from the OS X command line:

To stop PostgreSQL:
sudo SystemStarter stop postgresql

To start PostgreSQL:
sudo SystemStarter start postgresql

You might be able to do this:
sudo SystemStarter restart postgresql

If these don't work for some reason, feel free to post or email me the script in /Library/StartupItems

Hope this helps!