禁止Ctrl+Alt+Delete重新启动机器

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修改/etc/inittab文件，将“ca::ctrlaltdel:/sbin/shutdown -t3 -r now”一行注释掉。然后重新设置/etc/rc.d/init.d/目录下所有文件的许可权限，运行如下命令：

# chmod -R 700 /etc/rc.d/init.d/*

这样便仅有root可以读、写或执行上述所有脚本文件。