Just enough vi editor commands to survive

   vi starts in command mode.
   Can precede most commands with a number indicating how many times to
   do a command.  For example, hitting 42 followed by the down arrow will
   move the cursor down 42 lines.  "42x" will delete 42 characters.
   ESC        Change to command mode.

   Command mode:
   Move cursor with arrow keys.  If there aren't any arrow keys, j,k,h,l works.
   i          Change to insert mode.  Insert before cursor.
   a          Change to insert mode.  Insert after cursor.
   r          Replace 1 character.
   R          Overwrite mode.
   u          Undo last change
   x          Delete 1 character.
   dw         Delete 1 word.
   cw         Change word
   dd         Delete 1 line.
   yy         Yank 1 line
   P          Put yanked/deleted text before cursor.
   p          Put yanked/deleted text after cursor.
   ^F         Move down one screen
   ^B         Move up one screen
   G          Go to end of file.  If preceded by a number, go to that line.
   1G         is a way to go to the start of a file.
   ctrl-G     Display line number where cursor is.
   J          Join.  Merge next line with this line.
   /          Search.  Follow "/" with text to find.
   :          Change to command line.  ":" prompt appears at bottom of screen.

   Command line:
   wq             Write file and Quit
   q!             Quit, don't save file.
   %s/old/new/g   Substitute.  Replace "old" with "new" on all lines.
   f,ls/old/new/g   Replace on lines f to l (l=% last line) 
   r file.txt     Read "file.txt" into editor at line after cursor location.

   If you've never used vi before, here's a typical editor session:
   1.  Type "vi file.txt" at Unix command line prompt.
   2.  Move cursor to place where new text will be added.
   3.  Type "i" to change to insert mode.
   4.  Type new text.
   5.  Type ESC to go back to command mode.
   6.  Type ":" to go to command line.
   7.  At vi command line prompt, type "wq" and ENTER to write file and quit.


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