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aws ec2 describe-instances から jq で /etc/hosts 作成
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| aws ec2 describe-instances --region ap-northeast-1 | jq -r '.Reservations[].Instances[] | select(.State.Name == "running") | .PrivateIpAddress as $private_ip | select($private_ip != null) | select(.Tags != null) | .Tags[] | select(.Key == "hostname") | select(. != null) | .Value as $host | select($host != null) | "\($private_ip)\t\t\($host)"' | sort -k2 | expand -t 8 | |
| sed '/^# ADDED BY THE PROGRAM$/,$d' | sed -e :a -e '/^\n*$/{$d;N;};/\n$/ba' |
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