Well, I finally got off my butt and created a package with examples of how to use OSProcess and CommandLine. It only has a couple of examples until I dig up more examples. I think I started using OSProcess back in Pharo 4. I find it easier to use than OSSubprocess because you can just paste commands from the shell into command: and waitForCommand:. The package is on Smalltalkhub.com and the particulars for Monticello are:

MCHttpRepository
location: ‘http://www.smalltalkhub.com/mc/JohnPfersich/OSProcess-Examples/main’
user: ”
password: ”