The Vi (and its successor Vim, for Vi improved) text editor for Unix, GNU-Linux, and Mac OS X systems is a way to edit text files, including configuration, PHP, or HTML documents, through the command line interface. This includes, of course, using SSH to connect to a server.
To use it with even a minimum of efficiency, though, you need to know a fair number of its cheat codes– err, keyboard shortcuts.
These are resources the Agaric Designe Collective found useful (when we started out, now of course we can type sonnets and ASCII art on the command line in our sleep).
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