In general, debugger is utility that runs target program in controlled environment where you can control execution of program and see the state of program when program is paused.
GDB is such debugger, which is used to debug C/C++ programs.
We can tell debugger when to pause a program by setting breakpoints.
$ gdb a.out
Set Breakpoint : In order to break the program.
(gdb) b func_name or b line_no.
Run
(gdb) r or run
List : You will see some part of your program.
(gdb) l or list
Frame: It'll show where is the curser rightnow.
(gdb) f or frame
Next : You will go to next line.
(gdb) n or next
Print : To print variables.
(gdb) p main_var or print main_var
Step : Go inside the function.
(gdb) s fun1() or step fun1()
Backtrace: It will tell from where are you coming and at what point you are currnetly in your program.
(gdb) backtrace
Info b: It will show how many brakpoint you have.
(gdb) info b
Delete 1 : To delete breakpoint no. 1.
(gdb) delete 1
If you want to directly go to some function.
- Create a breakpoint at that function.
(gdb) continue fun3() or c fun3()
Info Local: Print all the variable of local in that fuction in that stack.
Here is the walkthrough of some basic commands:
