Summary of GDB The purpose of a debugger such as GDB is to allow you to see what is going on inside another program while it executes|or what another program was doing at the moment it crashed.
GDB can do four main kinds of things (plus other things in support of these) to help you catch bugs in the act:
• Start your program, specifying anything that might afect its behavior.
• Make your program stop on specifed conditions.
• Examine what has happened, when your program has stopped.
• Change things in your program, so you can experiment with correcting the efects of one bug and go on to learn about another.