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Ran into the exact same problem. Installed the Network Link Conditioner when my system had OSX Lion and XCode 4 or 5. Great tool but did not need it again until today. Found it no longer worked. My system now has OSX Yosemite and XCode 6.4 so I downloaded Hardware IO Tools for Xcode 6.3. Got the same message about not being able to replace it since it was ...


For Yosemite and newer, you can use sudo dscl . create /Users/UserName IsHidden 1 Source: https://support.apple.com/en-us/HT203998


Either try disabling the root user. Go to System Preferences >> Users & Groups >> Login Options >> Edit >> Open Directory Utility and in the top menu choose Edit and then Disable Root User. OR Go to System Preferences >> Users & Groups >> Login Options and select List of users.


The error you're getting is related to the sudo command. You're probably trying to run the script as the normal administrator. Instead, you can run it directly as root.

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