change volume_type for all EBS volumes in AWS

aws-change-volumes-type

#!/bin/bash
while getopts "f:t:h:" option; do
    case "${option}" in
        f ) FILTERS=$OPTARG;;
        t ) TYPE=$OPTARG;;
        h )
            echo "Usage:"
            echo "    ./aws-change-volumes-type -h Display this help message."
            echo "    ./aws-change-volumes-type -f 'Name=size,Values=5120' -t 'st1' "
            exit 0
           ;;
        \? )
           echo "Invalid option: $OPTARG requires an argument" 1>&2
           ;;
    esac
done

VOLUMES=$(aws ec2 describe-volumes --filter $FILTERS --query 'Volumes[].VolumeId[]' | grep vol | cut -d "\"" -f2)

#while IFS='' read -r line || [[ -n "$line" ]]; do
#    aws ec2 modify-volume --volume-id $line --volume-type $TYPE --dry-run
#done < "$GATHER"

for volume in $VOLUMES; do
   aws ec2 modify-volume --volume-id $volume --volume-type $TYPE --dry-run
       if [ $? -eq 0 ]]; then
           echo "$volume :: CHANGED;
       else
           echo "$volume :: UNCHANGED;
       fi
done