Editor

  1. The user can edit whatever has been entered since the beginning of the current syntactic object, in response to a syntax error message, or if the user wants to change something previously typed. If you prefer to start again, ``

    !clear

    '' will clear the typing buffer and allow you to start the input afresh.

  2. When the editor is invoked (by typing ``

    !edit

    ''), the user is prompted for the string that is to be modified. The user types the desired string, and the editor finds its first occurrence in the lines being edited.

  3. The user is then prompted for the replacement of this string. When it is entered, the change is made.

  4. The process repeats until the user enters a blank search line, at which time control is returned to ISETL.