You don't have write permissions for the /usr/bin directory.

weixin_34041003發表於2018-05-30
⁃   carnetdeiMac:~ carnet$ sudo gem install xcodeproj
-   ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /usr/bin directory.
-   sudo ========== > sudo gem install -n /usr/local/bin xcodeproj

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