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This question seems to imply OS X/macOS comes with the ruby framework rails. Is this correct? (I always thought OS X/macOS comes with ruby, but not rails)

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No, macOS does not come with rails preinstalled.

On a default clean install of macOS Catalinia, if you run the following command in Terminal, you'll see that rails is not installed by default.

% rails -v
Rails is not currently installed on this system. To get the latest version, simply type:

    $ sudo gem install rails

You can then rerun your "rails" command.
% 

I also tested this on some earlier versions of macOS and the result was the same.

If rails -v returns version info, then it's installed, but was done after macOS was originally installed.

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