The GNU Debugger, GDB, is the standard debugger on GNU/Linux and BSD systems, and can be used on just about any Unix system with a C compiler and at least one of several well-known object file formats. It can be used on other kinds of systems as well. It has a very rich feature set, making it the preferred debugger of many developers the world over.
This chapter covers the following topics:
The GDB text user interface
Group listing of GDB commands
Alphabetical summary of GDB commands
For more information, see Debugging with GDB: The GNU Source-Level Debugger, listed in the Bibliography.
A debugger is a program that lets you run a second program, which we will call the debuggee. The debugger lets you examine and change the state of the debuggee, and control its execution. In particular, you can single-step the program, executing one statement or instruction at a time, in order to watch the program's behavior.
Debuggers come in two flavors: instruction-level debuggers , which work at the level of machine instructions, and source-level debuggers , which operate in terms of your program's source code and programming language. The latter are considerably easier to use, and usually can do machine-level debugging if necessary. GDB is a source level debugger; it is probably the most widely applicable debugger (portable ...