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

用brew安裝的時候，你如果安裝一半就按Ctrl+Z停掉，這個時候brew有個臨時文件，你再次執行brew安裝其他包的時候就會報錯。

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

我們把臨時文件刪掉就好了。

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