A lot of threads explaining how to do various things require the command line interface. My problem is I don't know how to get there. I'm using Calibre 0.9.27 on a Mac running OS X (10.7.5, to be exact).
I've gone to Preferences/Advanced/Miscellaneous and clicked on "Install Command Line Tools." I get the message:
"Command line tools installed in /usr/bin. If you move calibre.app, you have to re-install the command line tools."
After that, however, I'm afraid I'm lost.