VI(1)                                                       VI(1)

          ex, vi - text editor

          ex [ - ] [ -v ] [ -t tag ] [ -r ] [ -R ] [ +command ] [ -l ]
          name ...

          edit [ options ]

          vi [ -t tag ] [ -r ] [ -R ] [ +command ] [ -l ] [ -wn ] name

          Ex is a superset of ed(1) with a display editing facility;
          edit is a simplified subset of ex; and vi is a fully
          display-based editor with similar capabilities.  Option -R
          makes the editor read-only.

          /usr/lib/ex?.?strings         error messages
          /usr/lib/ex?.?recover         recover command
          /usr/lib/ex?.?preserve        preserve command
          /etc/termcap             describes capabilities of terminals
          ~/.exrc                  editor startup file
          /tmp/Exnnnnn             editor temporary
          /tmp/Rxnnnnn             named buffer temporary
          /usr/preserve            preservation directory

          Edit: A Tutorial
          Ex Reference Manual
          An Introduction to Display Editing with Vi
          Vi Quick Reference Card, all in BSD 4.1 Progammer's Manual,
          Volume 2
          ed(1), jim(9.1), sed(1)

          The undo command causes all marks to be lost on lines
          changed and then restored if the marked lines were changed.
          Undo never clears the buffer modified condition.
          The z command prints a number of logical rather than physi-
          cal lines.  More than a screen full of output may result if
          long lines are present.
          File input/output errors don't print a name if the command
          line `-' option is used.
          There is no easy way to do a single scan ignoring case.
          The editor does not warn if text is placed in named buffers
          and not used before exiting the editor.
          Null characters are discarded in input files, and cannot
          appear in resultant files.

     VI(1)                                                       VI(1)

          Software tabs using ^T work only immediately after the
          The wrapmargin option can be fooled since it looks at output
          columns when blanks are typed.  If a long word passes
          through the margin and onto the next line without a break,
          then the line won't be broken.
          The source command does not work when executed as :source;
          there is no way to use the :append, :change, and :insert
          commands in vi, since it is not possible to give more than
          one line of input to a : escape.  To use these on a :global
          you must Q to ex command mode, execute them, and then reen-
          ter the screen editor with vi or open.