系统完整性保护(SIP)，也称为无根，是OS X 10.11中的一项新安全功能.默认情况下，它甚至禁止管理员访问/修改根目录.遵循这些步骤禁用SIP:

System Integrity Protection(SIP) aka rootless is a new security feature in OS X 10.11. By default it disables even the administrator to access/modify the root. Follow these steps to disable SIP:

1. 重新启动Mac.

1. Restart your Mac.

在OS X启动之前，按住Command-R并按住不放，直到看到Apple图标和进度条.释放.这双靴子 您进入恢复状态.

Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Release. This boots you into Recovery.

从实用工具"菜单中，选择终端".

From the Utilities menu, select Terminal.

在提示符下准确键入以下内容，然后按Return键:

At the prompt type exactly the following and then press Return:

 csrutil disable