ps ax | grep lookupd | grep -v grep | perl -ne 'split; print $_[0]' | xargs sudo kill -HUP
I'm often connecting to different networks depending on what job I'm doing, and sometimes I'll need to tweak my /etc/hosts file. Since my system will cache DNS lookups, I'll need to restart lookupd, and this command does it in one hit.
Refresh DNS in Leopard
sudo dscacheutil -flushcache
Refresh DNS in Yosemite
sudo discoveryutil udnsflushcaches
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