Emptying the DNS cache

Yesterday wrote a Python script, the function is to crawl a page of the Google IP address and then write to the local hosts inside.

But after writing it and running it, I found it wasn't Google. So I thought about whether to clear the DNS cache. But I only know win below empty cache, in cmd inside dozen Ipconfig/flushdns on the line, Mac with two months not too familiar, on the internet to find a bit, found that the Mac different systems need different commands. This is just a note of the Lion system's subsequent commands, which were not used before.

The commands of Lion, Mountain Lion, and Mavericks are sudo killall-hup mdnsresponder

Yosemite sudo discoveryutil mdnsflushcache

I reckon it's mavericks now except Yosemite.

Emptying the DNS cache