Comment 14 for bug 220656

I don't know if this issue is solve but i have made a script using zenity progress fully functional.

The script makes a backup file. The progress bar also works fine, it shows the exact percentage of the copy and if you press the cancel button close the zenity window and kill the copy process. I hope this would help to someone.

Here's a copy of the code i wrote.

#!/bin/bash

fuente=~/.VirtualBox/XP.vdi
destino=~/.VirtualBox/XP.vdi.backup

size="$(ls -l ~/.VirtualBox/XP.vdi | awk '{print $5}')"
copy=0
cp $fuente $destino &
while [ $copy -lt $size ]
do
 sleep 1
 porcentaje="$( echo "scale = 5 ; $copy / $size * 100 " | bc )"
 echo "#Copiando $copy bytes. Tamaño total: $size bytes."
 echo $porcentaje
 copy="$(ls -l $destino | awk '{print $5}')"
done | zenity --progress --width=350 --title='Creando XP.vdi.backup'

if [ "$?" = 1 ] ; then
 pidC="$(pidof cp)"
 kill $pidC
 rm -v $destino
 zenity --info --width=300 height--200 --title="Borrar Backup" --text="El proceso numero $pidC ha sido destruido.\n\nEl archivo $destino ha sido borrado."
fi

P.D. I'm from Mexico, thats why the labels and the variable's names are in spanish. Hope doesn't matter.