I suppose there may be a one-line Linux command to check that.
I don't know if you can specifically identify what you're looking for, and I'm not entirely sure what you mean since Google Apps is a suite of stuff. Sites are hosted by other products that form a part of Google Apps. I'm assuming that you mean to refer to Google Sites.
The function below actually looks for sites that contain
Define this function somewhere. You can type it directly into Bash, or put it into one of your shell startup files:
You can use it like this:
You said you wanted a one-liner. I'll leave that as an exercise for you, since representing this as a function is far superior, IMO. It could be done as a one-liner, but it'd be messy.