Sweave-Lyx from terminal on Mac

Mark Heckmann writes:
In your paper "Using Sweave with Lyx" (great work bty) you pointed out that one can see the sweave error code when processing when starting lyx from the terminal. I just changed from Windows to Mac so that's new for me. Could you send me a few lines how to do that, that is how to operate lyx from terminal and sweave the content from the terminal.
I am not familiar with Mac, though would be happy to own one;) Since Mac OS is build on top of some linux/unix like system you need to start the terminal (console) with shell and find the lyx binary. Perhaps something like this on my linux box (text following $ are shell commands)

# Find the lyx binary
$ which lyx

# Start lyx from console
$ lyx&

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