Library /sys$common/syshlp/basichelp.hlb Commands, EDIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The EDIT command lets you edit individual program  lines  in  the  BASIC
  environment  while invoking an editor.  If no argument is specified, the
  EDIT command:

   o  Invokes your default text editor
   o  Reads a copy of the current program into the editor's buffer
   o  Makes the edited program the current program when you exit from  the
      editor

  Example

  EDIT 100 /LEFT$/RIGHT$/
  EDIT 200 /INPUT/PRINT/2,3

  Format

      EDIT [ [ line-num ] search-clause [ replace-clause ] ]

        search-clause:  delim unq-str1 delim

        replace-clause:  [unq-str2] [delim [int-const1] [,int-const2]]