how to save command info to a file or register

:version
I will see some info on screen, but how can I save them, or copy them to clipboard or register. By the way, I use windows system.
I kown 'q:' can view the command histroy, 'q/' can view the search history. Is there some simular way?

:ruby 1
I will see some red error info on screen. How can save them?

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