How to use GDB

1. Compilation for GDB

Compile with -g flag

 

2. Run GDB

 -  Run a program with gdb

$ gdb <program>

 - Attach a running program with gdb

$ gdb
(gdb)attach <pid>

 - Run a program and a core with gdb

$ gdb <program> <core_file>

 

3. GDB commands

 - quit / q: quit GDB

 - run / r: run from start

 - break / b <location>: set a break point

 - watch <variable>: set a watch point

 - step / s: run a step

 - next / n: run next

 - continue / c: continue to the next break point

 - info break / locals / args: print the information of breakpoints / local variables / arguments for stack frame function

 - print <variable / pointer / function>: print the value of variable / address of pointer / address of function

 - list: print 10 lines of current source code

* location = file_name:function_name | file_name:line_number | class::function_name