卸载cocoapods：
localhost:~ je$ sudo gem uninstall cocoapods Remove executables: pod, sandbox-pod in addition to the gem? [Yn] Y ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /usr/bin directory. localhost:~ je$ sudo gem install cocoapods -n /usr/local/bin Successfully installed cocoapods-1.5.3 Parsing documentation for cocoapods-1.5.3 Done installing documentation for cocoapods after 3 seconds 1 gem installed localhost:~ jerry$