In vi, though, what I usually do is open a file first, and then if I want to 'sa...

_delirium on Aug 4, 2012 | parent | context | favorite | on: OS X Mountain Lion: Data Loss via 'Save As'

In vi, though, what I usually do is open a file first, and then if I want to 'save as', I do ':w newfile'. I don't have to decide before I open the file if I want to duplicate it or not, and it would be very unexpected behavior for ':w newfile' to also modify the original file.