snow leopard清空DNS缓存的方法
终于知道在雪豹下清空dns缓存的办法，leopard也应该适用
引用别人的原文：
sudo lookupd -flushcache was the way to update hosts cache before Leopard. Lookupd is gone now.
In Leopard, lookupd no longer exists. Instead force a DNS cache refresh with:
sudo dscacheutil -flushcache
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