Mine

#!/bin/bash

fsck=$(fsck_hfs -q /dev/sdd2 2>&1 | awk 'NR == 1 { print $4 }')

if [[ $fsck == DIRTY ]]; then

fsck_hfs -p /dev/sdd2

fsck=$(fsck_hfs -q /dev/sdd2 2>&1 | awk 'NR == 1 { print $4 }')

[[ $fsck == DIRTY ]] && fsck_hfs -fy /dev/sdd2
fi