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| chmod和数字改变文件或目录的访问权限 | |
| chown改变目录或文件的所有权 | |
| chown root $dir | |
| -R 递归子目录 | |
| http://soft.yesky.com/115/11046615.shtml | |
| echo "" >>/> file | |
| 在linux系统下，我们通常可以通过以下2条命令来简单了解当前系统的网络连接情况： | |
| #netstat -altn 得到当前所有网络连接信息 | |
| #netstat -ntlp 得到系统所开放的网络端口 |
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