How to continuously monitor rhythmbox for track change using bash

I'd like to do the same thing as is described here, but using shell scripting (preferably in bash) instead of python. It seems like suc开发者_如何学Goh a thing should be possible using dbus-monitor, but I'm not very familiar with dbus, and it's not clear to me how to take the concepts described in the solution to the python question and apply them to the dbus-monitor tool.

Here's the simplest way I could find:

#!/bin/bash

interface=org.gnome.Rhythmbox.Player
member=playingUriChanged

# listen for playingUriChanged DBus events,
# each time we enter the loop, we just got an event
# so handle the event, e.g. by printing the artist and title
# see rhythmbox-client --print-playing-format for more output options

dbus-monitor --profile "interface='$interface',member='$member'" |
while read -r line; do
    printf "Now playing: "
    rhythmbox-client --print-playing
done

It produces output like this:

Now playing: Daft Punk - Overture
Now playing: Daft Punk - The Grid

It also prints the currently playing song when started up. If that is not what you want, look at the contents of $line and see if it contains NameAcquired or playingUriChanged. If it contains NameAcquired, skip it.

The main difference between the Python version and this bash version is that the Python version uses DBus to get the playing song information. I couldn't find a good way to do that using bash, but rhythmbox-client --print-playing seems to work well.