From The Free On-line Dictionary of Computing (30 December 2018) :
dbxA 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)