Flush DNS cache on MacOS

For most versions of OSX and macOS I have found the following works

sudo killall -HUP mDNSResponder

I have seen notes to indicate that 

dnscacheutil -flushcache 

or

discoveryutil udnsflushcaches

are needed for  Yosemite and older versions.

Thanks to: https://help.dreamhost.com/hc/en-us/articles/214981288-Flushing-your-DNS-cache-in-Mac-OS-X-and-Linux amongst other sites.

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