bash function to offline an arbitrary scsi device

offline.sh

function offline() {
    if [[ "$EUID" -ne '0' ]]; then
        echo "This function requires root privileges"
        return 1
    elif [[ "$#" -ne '1' ]]; then
        echo "Usage: $FUNCNAME <device node>"
        return 1
    fi

    # basename
    local device="${1##/dev/}"

    # sync and sleep mostly for superstitious reasons
    sync
    echo offline > /sys/block/${device}/device/state
    sleep .5
    echo 1 > /sys/block/${device}/device/delete
}