brew update 没有权限解决办法

爆出下面的错误

mac 运行 brew update

Error: /usr/local is not writable. You should change the ownership

and permissions of /usr/local back to your user account:

sudo chown -R $(whoami) /usr/local

解决命令

sudo chown -R $(whoami):admin /usr/local

这样就可以update了

udpate成功之后 homebrew 会有如下提示，我们可以通过下面的命令关闭授权

Homebrew no longer needs to have ownership of /usr/local. If you wish you can

return /usr/local to its default ownership with:

sudo chown root:wheel /usr/local