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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 ...


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


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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.


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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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