Shortform for the "vi" Unix text editor.

      Note that upper and lower case is very important.


      Edit a file
      ===========
      vi filename     where <filename> is the file to edit


      Cursor movement
      ===============
      h     cursor left           w     next word
      l     cursor right          b     previous word
      k     cursor up
      j     cursor down


      Text insert and delete
      ======================
      vi has two modes, command mode and text insertion mode.

      To enter the insert mode type either i or a,

      i     insert text at cursor
      a     insert text one position right of cursor

      To exit text mode and enter command mode, press the ESC key

      x     delete one character at cursor
      dd    delete current line
      dw    delete from cursor to end of word
      cw    enters change word mode and changes word (from cursor to end
            of word) to what you key in. Exit cw by pressing the ESC key.

      u     undo previous command


      Search and replace
      ==================
      /string     search forward for <string>, case sensitive
      ?string     search backwards for <string>, case sensitive
      n           repeat previous search


      Save and exit
      =============
      ZZ    save current file and exit vi
      :q!   exit vi without saving current file