From The Free On-line Dictionary of Computing (30 December 2018) :
dbx
A source-level debugger originating from BSD
Unix but now available for many other Unix distributions.
Sun documentation
http://developers.sun.com/sunstudio/documentation/ss12/mr/man1/dbx.1.html)">(http://developers.sun.com/sunstudio/documentation/ss12/mr/man1/dbx.1.html).
(2009-04-27)