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脚本名称为hello.py，内容如下：
import gdb
class HelloPrefixCommand( gdb.Command ):
"just to say hello"
def __init__(self):
super( HelloPrefixCommand, self).__init__("hello",
gdb.COMMAND_SUPPORT,
gdb.COMPLETE_NONE, True )
HelloPrefixCommand()
加载方法1：
sudo gdb httpd -x hello.py
查看一下：
(gdb) help hello
just to say hello
List of hello subcommands:
Type "help hello" followed by hello subcommand name for full documentation.
Type "apropos word" to search for commands related to "word".
Command name abbreviations are allowed if unambiguous.
加载方法2：
(gdb) source hello.py
查看一下：
(gdb) help hello
just to say hello
List of hello subcommands:
Type "help hello" followed by hello subcommand name for full documentation.
Type "apropos word" to search for commands related to "word".
Command name abbreviations are allowed if unambiguous.
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