How to disable System Integrity Protection in High Sierra?

Not recommend unless you have a very specific reason. Re-enabling is import part of security protection

1. Restart your Mac.
2. From Recovery hold down Command-R and keep it held down until you see an Apple icon and a progress bar. ...
3. From the Utilities menu, select Terminal.
4. At the prompt type exactly the following and then press Return: csrutil disable /

   csrutil enable

https://developer.apple.com/library/content/documentation/Security/Conceptual/Sy stem_Integrity_Protection_Guide/Configur…

there where report early on of a bug in executing the csrutil. YMMV

"...even with SIP officially "disabled" it was still active; preventing writes to /System and modifying Apple programs..."

Hi Leroy,

I think there is a misunderstanding: the csrutil is not there. It's not available at all.

This is a problem I'm experiencing too, since it prevents me to installing reFind (to dual boot Ubuntu); after entering Recovery mode and operning a terminal, typing any prefix of "csrutil" won't trigger any TAB completition because the command is just not there.

If we try to execute the one available in /Volumes/MacBookPro HD/usr/bin/csrutil, it will be "Killed: 9" immediately.

So, that said, how can I disable the SIP on High Sierra?

Thanks