SIP (System Integrity Protection) isn’t a bad thing. It actually protects your mac from a whole host of otherwise nasty infections. However, it can sometimes get in the way of doing important mac management tasks.
To disable SIP:
- Boot the mac to recovery mode (boot while holding down control-R)
- In Terminal enter the command:
csrutil disable - Then reboot the mac to it’s normal OS.
Remember to re-enable SIP when you are done by booting back into recovery mode and giving the command: csrutil enable