1 root@ubuntu:/home/leo/test/project/classes# gdb test  2 GNU gdb (Ubuntu 7.10-1ubuntu2) 7.10 3 Copyright (C) 2015 Free Software Foundation, Inc. 4 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> 5 This is free software: you are free to change and redistribute it. 6 There is NO WARRANTY, to the extent permitted by law.  Type "show copying" 7 and "show warranty" for details. 8 This GDB was configured as "x86_64-linux-gnu". 9 Type "show configuration" for configuration details.10 For bug reporting instructions, please see:11 <http://www.gnu.org/software/gdb/bugs/>.12 Find the GDB manual and other documentation resources online at:13 <http://www.gnu.org/software/gdb/documentation/>.14 For help, type "help".15 Type "apropos word" to search for commands related to "word"...16 Reading symbols from test...done.17 (gdb) 

(gdb) set args 5 设置第一个参数为5

(gdb) show args
Argument list to give program being debugged when it is started is "5".

(gdb) b 8 在第8行设置断点Breakpoint 1 at 0x4004f0: file main.cpp, line 8.(gdb) 

(gdb) b add_intBreakpoint 3 at 0x400660: file math/add_int.cpp, line 5.

(gdb) b add_int if num1 == 1Breakpoint 4 at 0x400660: file math/add_int.cpp, line 5.

(gdb) info breakpoints Num     Type           Disp Enb Address            What4       breakpoint     keep y   0x0000000000400660 in add_int(int, int)                                                    at math/add_int.cpp:5    stop only if num1 == 1    breakpoint already hit 1 time

(gdb) list1    #include "stdlib.h"2    #include "stdio.h"3    4    int add_int(int, int);5    float add_float(float, float);6    7    int main(int argc, char *argv[])8    {9        int value = http://www.mamicode.com/(*argv[1]) - ‘0‘;10        printf("Leo is here %d . \n", value);(gdb) list11    12        int num1 = add_int(1, 2);13        float num2 = add_float(2.3, 4.5);14        printf("result is %d %f.", num1, num2);15    16        getchar();17    18        return 0;19    }(gdb) listLine number 20 out of range; main.cpp has 19 lines.(gdb) 

(gdb) b 8Breakpoint 1 at 0x4004f0: file main.cpp, line 8.(gdb) run 5 可以直接在run后面可以跟运行参数，也可以用set设置运行参数Starting program: /home/leo/test/project/classes/test 5Breakpoint 1, main (argc=2, argv=0x7fffffffe018) at main.cpp:88    {(gdb) 

(gdb) b 8Breakpoint 1 at 0x4004f0: file main.cpp, line 8.(gdb) run 5Starting program: /home/leo/test/project/classes/test 5Breakpoint 1, main (argc=2, argv=0x7fffffffe018) at main.cpp:88    {(gdb) display argc 查看运行参数个数1: argc = 2(gdb) display argv[1] 查看第一个运行参数的值2: argv[1] = 0x7fffffffe38b "5" (gdb) 

(gdb) b 8Breakpoint 1 at 0x4004f0: file main.cpp, line 8.(gdb) run 5Starting program: /home/leo/test/project/classes/test 5Breakpoint 1, main (argc=2, argv=0x7fffffffe018) at main.cpp:88    {(gdb) cContinuing.Leo is here 5 . result is 3 6.800000.

[Inferior 1 (process 4009) exited normally]

(gdb) b 8Breakpoint 1 at 0x4004f0: file main.cpp, line 8.(gdb) run 7Starting program: /home/leo/test/project/classes/test 7Breakpoint 1, main (argc=2, argv=0x7fffffffe018) at main.cpp:88    {(gdb) display argv[1]1: argv[1] = 0x7fffffffe38b "7"(gdb) set argv[1] = "8" 将第一个运行参数的值从字符串“7”改为“8”(gdb) cContinuing.Leo is here 8 . result is 3 6.800000.

[Inferior 1 (process 4009) exited normally]

(gdb) qA debugging session is active.    Inferior 1 [process 3997] will be killed.Quit anyway? (y or n) y

(gdb) whatis num1type = int(gdb) 

(gdb) ptype utype = struct User {  int id  char name[20]    }

(gdb) s6    }2: num2 = 21: num1 = 1(gdb) nmain (argc=<optimized out>, argv=<optimized out>) at main.cpp:1313        float num2 = add_float(2.3, 4.5);(gdb) 

(gdb) bt#0  add_int (num1=num1@entry=1, num2=num2@entry=2) at math/add_int.cpp:6#1  0x000000000040051b in main (argc=<optimized out>, argv=<optimized out>)    at main.cpp:12(gdb)