Shell script to rebuild VirtualBox kernel extensions under Mac OS X

reload_vb_kernel.sh

#!/bin/bash

unload() {
	if [ `ps -ef | grep -c VirtualBox$` -ne 0 ]
	then
		echo "VirtualBox still seems to be running. Please investigate!!"
		exit 1;
	elif [ `ps -ef | grep -c [V]ir` -gt 0 ]
	then
		echo "Stopping running processes before unloading Kernel Extensions"
		ps -ef | grep [V]ir | awk '{print $2}' | xargs kill
	fi
	echo "Unloading Kernel Extensions"
	kextstat | grep "org.virtualbox.kext.VBoxUSB" > /dev/null 2>&1 && sudo kextunload -b org.virtualbox.kext.VBoxUSB
	kextstat | grep "org.virtualbox.kext.VBoxNetFlt" > /dev/null 2>&1 && sudo kextunload -b org.virtualbox.kext.VBoxNetFlt
	kextstat | grep "org.virtualbox.kext.VBoxNetAdp" > /dev/null 2>&1 && sudo kextunload -b org.virtualbox.kext.VBoxNetAdp
	kextstat | grep "org.virtualbox.kext.VBoxDrv" > /dev/null 2>&1 && sudo kextunload -b org.virtualbox.kext.VBoxDrv
}

load() {
	echo "Loading Kernel Extentions"
	sudo kextload "/Library/Application Support/VirtualBox/VBoxDrv.kext" -r "/Library/Application Support/VirtualBox/"
	sudo kextload "/Library/Application Support/VirtualBox/VBoxNetAdp.kext" -r "/Library/Application Support/VirtualBox/"
	sudo kextload "/Library/Application Support/VirtualBox/VBoxNetFlt.kext" -r "/Library/Application Support/VirtualBox/"
	sudo kextload "/Library/Application Support/VirtualBox/VBoxUSB.kext" -r "/Library/Application Support/VirtualBox/"
}

case "$1" in
	unload|remove)
		unload
		;;
	load)
		load
		;;
	*|reload)
		unload
		load
		;;
esac