Add availability to GNS3 appliance files

availability.sh

#!/bin/bash

echo "Availability:"
echo "1 - free"
echo "2 - with-registration"
echo "3 - free-to-try"
echo "4 - service-contract"
echo
echo

for FILE in `ls *gns3a`
do
    echo -en "\033[1A\033[2K${FILE}: "
    read CHOICE

    case $CHOICE in
        1)
            AVAILABILITY="free";;
        2)
            AVAILABILITY="with-registration";;
        3)
            AVAILABILITY="free-to-try";;
        4)
            AVAILABILITY="service-contract";;
    esac

    sed -i "s/    \"maintainer\"/    \"availability\": \"${AVAILABILITY}\",\n    \"maintainer\"/" $FILE

done