各种系统更新dns缓存方法

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Windows:
ipconfig /flushdns

Debian/Ubuntu:
sudo /etc/rc.d/init.d/nscd restart

Linux with systemd:
sudo systemctl restart network.service

Fedora Linux:
sudo systemctl restart NetworkManager.service

Arch Linux/Manjaro with Network Manager:
sudo systemctl restart NetworkManager.service

Arch Linux/Manjaro with Wicd:
sudo systemctl restart wicd.service

Mac OS X:
sudo dscacheutil -flushcache;sudo killall -HUP mDNSResponder