bash whiptail examples

#!/bin/bash
# bash script to run bad blocks and fsck
# not working uses whiptail

temp=$(mktemp -t temp.XXXXX)
_badblocksout=$(mktemp -t badblock.XXXXX)
_lsblkout=$(mktemp -t _lsblkout.XXXX)
_lsblkselection=$(mktemp -t _lsblkselection.XXXXX)
echo $temp
listblk () {

        lsblk | awk '{print $1 " " $7" 0\\"}' | sed 's/  / _ /g' > $_lsblkout
        whiptail --radiolist 'Choose' 50 40 40 $(cat $_lsblkout) 2> $_lsblkselection

}

runbadblocks () {
        sudo badblocks -nsv -o $_badblocksout $_lsblkselection
}

runfsck () {
        sudo fsck -l <badblocks file> /dev/sda1
}


menu () {

        whiptail --menu 'run bad blocks and fsck' 40 50 30 'Choose a device' '1' 2>$temp
}

listblk
exit
while menu
do
        selection=$(cat $temp)
        echo $selection

        case $temp in
        'Choose a device')
                listblk;;
        *)
                echo 'What?';;
        esac
done