Run a Virtualbox VM in background and safely save its state if SIGINT is sent

vm.win7word

#!/usr/bin/env bash

# trap signals
trap vmsavestate INT

function vmsavestate() {
    cleaner=$(head -c $(( $(tput cols) - 1 )) < /dev/zero | tr '\0' ' ')
    echo -en "\r${cleaner}\rSaving state of 'win7word' "
    vboxmanage controlvm win7word savestate
}

# run the VM and wait for normal exit or Ctrl-C
/usr/lib/virtualbox/VirtualBox --comment "win7word" --startvm "0c2c6c8f-c448-448c-8a53-683f56439613" &
PID=$!
echo -n "'win7word' virtual machine is running under pid $PID. You may safely terminate the VM using Ctrl-C."
wait $PID  # wait for SIGINT or normal exit