没声音
终端输入：sudo killall coreaudiod
触控板手势无效
终端输入：killall Dock
清除DNS缓存
终端输入：sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
Homebrew
执行更新：brew update
检查过时软件包：brew outdated
执行升级：brew upgrade
清理缓存：brew cleanup
终端输入：sudo killall coreaudiod
终端输入：killall Dock
终端输入：sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
执行更新：brew update
检查过时软件包：brew outdated
执行升级：brew upgrade
清理缓存：brew cleanup
