What is /dev/null

转载于 2010-03-31 17:02:00 发布 · 302 阅读

文章标签：

#logging #redirect #comments #command #file #windows

/dev/null 是一个特殊的文件，在 UNIX 和 Linux 系统中用于丢弃不需要的数据。当进行系统安全加固时，黑客可能会利用它来隐藏自己的行为，例如通过重定向日志到 /dev/null 来阻止系统记录 bash 命令历史。这个术语也被通俗地用来指代忽视或忽略某些事物。

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/dev/null: On UNIX, this is a virtual-file that can be written to. Data written to this file gets discarded. It is similar to the file call NUL on Windows machines. Key point: When rooting a machine, intruders will often redirect logging to /dev/null For example, the command ln -s /dev/null .bash_history will cause the system to stop logging bash commands. Culture: In the vernacular, means much the same thing as black hole. Typical usage: if you don't like what I have to say, please direct your comments to /dev/null.

come from: http://linux.about.com/cs/linux101/g/slshdevslshnull.htm