命令行执行命令时报错You don't have write permissions for the /Library/

这是因为要执行这些操作时必须有管理员的权限(比如更新软件),比如更新cocoapods时报错:

MyPro:~ MyPro$ gem install cocoapods
ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

解决方法:只需要在命令前加上sudo,例如:sudo gem install cocoapods即可。sudo是获取管理员权限,现在按照步骤输入管理员密码即可。

但,接着又报错:

MyPro:~ MyPro$ sudo gem install cocoapods
Password:
ERROR: While executing gem ... (Errno::EPERM) Operation not permitted - /usr/bin/pod

解决办法:

sudo gem install -n /usr/local/bin cocoapods

治标不治本,下一次还会再出现,永久解决办法:

命令行工具网址:http://brew.sh
运行命令行:

$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
$ brew install ruby

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