CHANGE_CASE

    Changes the case of all alphabetic characters in a buffer, range, or
    string, according to the keyword that you specify.

 Syntax

    CHANGE_CASE ({buffer | range | string}, {LOWER | UPPER | INVERT}

 Parameters

    buffer     The buffer in which the case will be changed.

    range      The range in which the case will be changed.

    string     The string in which the case will be changed.  CHANGE_CASE
               has no effect on string constants.

    LOWER      To change letters to all lowercase.

    UPPER      To change letters to all uppercase.

    INVERT     To change uppercase letters lowercase, and lowercase letters
               to uppercase.

 Example

    CHANGE_CASE (main_buffer, UPPER);

    Makes all characters in the main buffer uppercase.  If you enter this
    on the command line and if the buffer is associated with a visible
    window, you will see the changes take effect immediately.