I recently modified /etc/resolv.conf on all of my global zones after building new nameservers. I wanted a quick way to copy this updated configuration to all child zones. A simple one-liner does the trick on each global zone (assuming all your zones are in the /var/zones zonepath):
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# zoneadm list | grep -v global | while read zone; do cp -p /etc/resolv.conf /var/zones/${zone}/root/etc; done |