GCC Debugging/gdb

Preping for the debugger program must first be compiled for debugging: gcc -g <filname.c> -o <output filename> eg: gcc -g debug_me.c -o debug_me the "-g" flag is important (To create symbol table) Starting the debugger start the debugger with: gdb <program name> eg: gdb debug_me common commands run, print, where, break, cond, step, next, set, ignore run runs the program to pass arguments to the program on run: run <arg1> <arg2> eg: run 12 35 eg: run "hello world" "goodbye world" break sets a "breakpoint" at a certain area \ function break <function name> eg: break main or eg: b main break <filename>:<line of code to stop in> eg: break debug_me.c:5 b shorthand for break next execute next line of code eg: next step next line of code, stepping into functions eg: step continue go to next breakpoint or end of program cont shorthand for continue print print out a variables \ expressions contents print <variable name> eg: print x disp prints out a variable \ expression value every step eg: disp x undisplay cancel a display command eg: undisplay 3 would stop the var at pos 3 from displaying every time where move within the call stack ... up and down up: previous step inside call stack down: next step inside call stack list shows code at a certain location list <no args> code at current location and then at next location if typed again eg: list list - shows code at previous location and then at the location before that if typed again list <function name> shows code in function definition eg: list func1 cond conditional cond <breakpoint> <condition> eg: cond 1 val>0 stop at breakpoint "1" when "val" becomes greater than 0 set change a value, eg set variable x = 12 will change x's value to 12 ignore ignore a breakpoint for a user specified number of times. usage: ignore <id> <count> ignore 2 20 --> Breakpoint 2 will not be hit for 20 times. quit exits the gdb q shorthand for quit