First and foremost we need to have mplayer installed, if your on a ubuntu-debian based system use the following commandto install mplayer, if not then you can download the appropriate packages and install them.
apt-get install mplayer
Lets make a home for our script file, and set the appropiate permissions
mkdir ~/scripts; touch ~/scripts/playme.sh; chmod +x ~/scripts/playme.sh; gedit ~/scripts/playme.sh
Paste the following code into your new script file, if you keep your Music files in a different location then change the variable musdir to match your setup.
#/bin/bash
#VARS###################################
tmpdir='/tmp'
musdir='/home/osamad/Music'
filename='playlist.m3u'
# CODE ##########################################
find $musdir -name '*.mp3' -o -name '*.ogg' 2>/dev/null >> $tmpdir/$filenamemplayer -playlist $tmpdir/$filename -shuffle -loop 0 -radio volume=80
Using find we build a list of all our mp3s, in this case we have multiple types of media files we want to play so we can specify that by adding the -o -name flags and add them in.
-playlist ;flag we set the playlist file we just created
-shuffle ; enables shuffle mode
-loop 0 ; enables loop 0=forever
-radio volume=80 ; set the default volume to 80% (use * or / to adjust when playing)
RunTime
Push ALT+F2 or launch from a terminal
./scripts/playme.sh
MORE
To find out more information, or to customize your mplayer settings
man mplayer
Create a custom launcher and run your script from the gnome-panel
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