(OS X) Merges multiple Recovery HDs back into Macintosh HD (JAMF Casper Suite Defect D-007146)

fixMultipleRecoveryHDs.sh

#!/bin/bash
# Jacob Salmela
# 2014-07-11
# Fix multiple Recovery HDs created by Casper Imaging from Defect D-007146

# Get last extra Recovery HD by parsing out the bootable Recovery HD, leaving only the extra partitions
lastExtraRecovery=$(diskutil list | awk "/Recovery HD/" | grep -v "Apple_Boot" | awk '{print $7}' | tail -n1)

# Get Macintosh disk ID
systemVolume=$(diskutil list | awk "/Macintosh HD/" | grep -v "Apple_Boot" | awk '{print $7}')

# Erase extra Recovery drives and merge them with Macintosh HD
diskutil mergePartitions JHFS+ "Macintosh HD" $systemVolume $lastExtraRecovery