Previously, in KDE, this was simple -- I called KDialog with number of steps, I got DCOP handle in return, then I called dcop with that reference and step, and progress dialog got updated.
However, now DCOP is obsolete, and since I moved from KDE 3.5.10 to XFCE, I thought it would be a good idea that instead converting my script from KDialog+DCOP to KDialog+DBUS I migrate to XFCE progress dialog.
So how do you build progress dialog for Bash purposes in XFCE? Bash purpose = I perform some computation in Bash, but the progress is shown in GUI way, as nice dialog on the desktop.