This is a modified version of the Korn Shell debugger from Bill Rosenblatt's `Learning the Korn Shell', published by O'Reilly and Associates (ISBN 1-56592-054-6). The original `kshdb' is available for anonymous FTP with the URL http://examples.oreilly.com/korn/ksh.tar.Z A revised edition is available at: http://examples.oreilly.com/korn2/korn2_examples.tar.gz