Run command on multiple AWS hosts by name

multirunner

#!/bin/bash
if [ "$#" -ne 3 ]; then
    echo "Illegal number of parameters"
    echo "Usage: multirunner {profile} {hostspec} {command}"
    exit
fi
PROFILE=$1
HOSTSPEC=$2
COMMAND=$3
TEMPFILE="/tmp/awsHosts.txt"
echo "Getting list of hosts matching ${HOSTSPEC} from ${PROFILE}"
aws ec2 describe-instances --profile ${PROFILE} --output text --query 'Reservations[*].Instances[*].[Tags[?Key==`Name`] | [0].Value,PrivateIpAddress]' --filters "Name=tag:Name,Values=${HOSTSPEC}" "Name=instance-state-name,Values=running" | sort > $TEMPFILE
if [ "$?" -ne 0 ]; then
    echo "Unable to retrieve list of hosts"
    exit
fi

echo "Going to run ${COMMAND} on the following host(s):"
column -t $TEMPFILE
read -p "Are you sure? " -n 1 -r
echo    # (optional) move to a new line
if [[ $REPLY =~ ^[Yy]$ ]]
then
    cat $TEMPFILE | while read line; do
        host=$(echo $line | awk '{ print $1 }')
        ip=$(echo $line | awk '{ print $2 }')
        echo "$host ($ip) --"
        ssh sipuser@$ip "${COMMAND}" < /dev/null
    done
else
    echo "Aborted."
    exit    
fi