The GNU symbolicdebugger, GDB, is a powerful development tool, but one drawback is it works only from the command line.
GNU symbolic debugger(GDB)是一个强大的开发工具,但是不足之处在于它只能在命令行下工作。
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The attach 4009 command starts debugging the currently running nweb server, and the GDB Debugger responds in kind by reading all the symbolic information about the process it can.