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I am running Apache on my localhost. From a PHP script run as www-user I would like to control Rhythmbox playback on my machine. So far I have a simple command in my PHP script: exec('rhythmbox-client --pause'); This works great when I run it from the command-line as me, but if it runs as www-user I guess rhythmbox-client doesn't know/can't access my instance of Rhythmbox. Is there an easy way for that PHP script to run as my user rather than www-user, or to tell rhythmbox-client which instance to control? The overall application is that when my phone goes off-hook it calls my PHP script which pauses music, and resumes playback when the phone is on-hook. I love VoIP phones! Solution: Thanks to Carpetsmoker and Tarek I used sudo as the answer but there was a couple of problems. To overcome them I did the following: Created a bash script to call rhythmbox-client . This bash script was executed using sudo in PHP as described in the answer below. Unfortunately rhythmbox-client didn't know what environment to control, so the bash script looks like this: #! /bin/bash DBUS_ADDRESS=`grep -z DBUS_SESSION_BUS_ADDRESS /proc/*/environ 2> /dev/null| sed 's/DBUS/\nDBUS/g' | tail -n 1` if [ "x$DBUS_ADDRESS" != "x" ]; then export $DBUS_ADDRESS /usr/bin/rhythmbox-client --pause fi Now that bash script can be executed by PHP and wwwuser, and my phone can pause/play my music!

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