“restricted” folder/files in OS X El Capitan

Question

After upgrading from OS X Yosemite to OS X El Capitan Developer Preview, I tried to edit /System/Library/LaunchDaemons/ssh.plist to change the default SSH

Answer 1

Until 10.11 unprotects certain files in /System/Library or allows you to do it yourself, the only way without disabling SIP would be to make a different service by coping the file somewhere else, like:

sudo cp /System/Library/LaunchDaemons/ssh.plist /Library/LaunchDaemons/ssh.plist

And then instead of using the Sharing panel in System Preferences, you would manage the service yourself:

sudo launchctl unload /Library/LaunchDaemons/ssh.plist
sudo launchctl load -w /Library/LaunchDaemons/ssh.plist