Get OpenStack instances with specific image prefix

gistfile1.txt

#!/bin/bash

PREFIX="centos"
STATUS="ACTIVE"

INSTANCES="$(nova list | awk -v status="$STATUS" '$6 == status { print $4 }')"
for INSTANCE in $INSTANCES; do
    IMAGE="$(nova show "$INSTANCE" | awk -v prefix=$PREFIX '$2 == "image" && $4 ~ "^"prefix { print $4 }')"
    echo "$INSTANCE" "$IMAGE"
done

# EOF