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Introduction If you haven't already done so, you might want to read the intro to hidden preferences . Now, you've probably seen lots of hidden preferences by this point, and you're familiar with the defaults command, but maybe you've wondered how people figure them out...
Gdb is a debugger for C (and C++). It allows you to do things like run the program up to a certain point then stop and print out the values of certain variables at that point, or step through the program one line at a time and print out the values of each variable after executing each line.
Adapted from http://www.cs.princeton.edu/~benjasik/gdb/gdbtut.html