Dbx (debugger)

 
dbx is a source-level debugger found primarily on Solaris, AIX, IRIX, Tru64 UNIX, Linux and BSD operating systems. It provides symbolic debugging for programs written in C, C++, Fortran, Pascal and Java. Useful features include stepping through programs one source line or machine instruction at a time. In addition to simply viewing operation of the program, variables can be manipulated and a wide range of expressions can be evaluated and displayed.
History.
dbx was originally developed at University of California, Berkeley, by Mark Linton during the years 1981–1984 and subsequently made its way to various vendors who had licensed BSD.
Availability.
Besides being provided to various vendors through BSD, dbx has also found its way into other products: