Oracle VirtualBox Extension Pack update helper (based on https://forums.virtualbox.org/viewtopic.php?f=7&t=44337#p199593).

vbox-ext-update.sh

#!/bin/bash

# license: MIT
# author: Florian Bender
# original script: Sasquatch (https://forums.virtualbox.org/viewtopic.php?f=7&t=44337#p199593)
# see comment below!

version=$(vboxmanage -v)
echo -n "Installed: $version; "
var1=$(echo $version | cut -d 'r' -f 1)
echo -n "Version $var1 "
var2=$(echo $version | cut -d 'r' -f 2)
echo "Build $var2 "
file="Oracle_VM_VirtualBox_Extension_Pack-$var1-$var2.vbox-extpack"

load=''
echo "--> Download '$file'? "
if [ -e /tmp/$file ]
then
        echo "Already loaded:"
else
        select load in "yes" "no"
        do
                if [ "$load" != "yes" ]
                then
                        echo "Aborting."
                        exit 1;
                fi
                break;
        done

        echo "Loading ..."
        wget http://download.virtualbox.org/virtualbox/$var1/$file -O /tmp/$file
        echo "Result: $?"
fi

echo $(ls -hal /tmp/$file)

inst=''
echo "--> Install '$file' (may need uninstall for major version upgrade)?"
select inst in "replace" "uninstall+reinstall" "no"
do
        if [ "$inst" == "replace" ]
        then
                echo "Replacing ..."
                sudo VBoxManage extpack install /tmp/$file --replace
                exit $?;
        fi
        if [ "$inst" == "uninstall+reinstall" ]
        then
                echo "Uninstalling ..."
                ## MAY be needed for major version upgrades, e.g. 4.0 -> 4.1! see https://forums.virtualbox.org/viewtopic.php?f=7&t=44337#p199593
                sudo VBoxManage extpack uninstall "Oracle VM VirtualBox Extension Pack"
                echo "Reinstalling ..."
                sudo VBoxManage extpack install /tmp/$file
                exit $?;
        fi
        break;
done

echo "Nothing to do here ..."

exit 1;