省事的命令：
show user ：
(gdb) show user adder
User command "adder":
print
$arg0+$arg1+$arg2
(gdb) define adder
Type commands for definition of "adder".
End with a
line saying just "end".
>print $arg0+$arg1+$arg2
>end
(gdb) adder
1 2 3
6
初始化脚本 .gdbinit
gdb 初始过程
1 executes all command from system init file （like /etc/bashrc）
2 executes home init file （like ~/.bashrc）
3 process command line options
4 executes all the commands from (./.exrc)
5 -x specified init file
6 load history command
set history filename xxx
set history save on/off
show history
show commands
------------------------
i handle = info handle = info signals
------
chechpoint
info checkpoint
restart checkpoint-id
kkkk
las-mile