使用brew update报错[Error Another active Homebrew update process is already in progress]

用brew安装的时候，你如果安装一半就按Ctrl+Z停掉，这个时候brew有个临时文件，你再次执行brew安装其他包的时候就会报错。

Error: Another active Homebrew update process is already in progress.

解决办法，删除临时文件

rm -rf /usr/local/var/homebrew/locks