Package ddd

GUI for several command-line debuggers

http://www.gnu.org/software/ddd/

The Data Display Debugger (DDD) is a popular GUI for command-line
debuggers like GDB, DBX, JDB, WDB, XDB, the Perl debugger, and the
Python debugger. DDD allows you to view source texts and provides an
interactive graphical data display, in which data structures are
displayed as graphs. You can use your mouse to dereference pointers
or view structure contents, which are updated every time the program
stops. DDD can debug programs written in Ada, C, C++, Chill, Fortran,
Java, Modula, Pascal, Perl, and Python. DDD provides machine-level
debugging; hypertext source navigation and lookup; breakpoint,
watchpoint, backtrace, and history editors; array plots; undo and
redo; preferences and settings editors; program execution in the
terminal emulation window, debugging on a remote host, an on-line
manual, extensive help on the Motif user interface, and a command-line
interface with full editing, history and completion capabilities.

General Commands (Section 1)
ddd
DDD is a graphical front-end for GDB and other command-line debuggers. Using DDD, you can see what is going on “inside” another program while it executes—or...