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+   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 affect its
+     behavior.
+
+   * Make your program stop on specified conditions.
+
+   * Examine what has happened, when your program has stopped.
+
+   * Change things in your program, so you can experiment with
+     correcting the effects of one bug and go on to learn about
+     another.