configure_sound.sh

#!/bin/bash

if [ "$(id -u)" != "0" ]; then
	echo "Please use sudo configure_sound.sh."
  	echo "ERROR: You are not root."
	exit 1
fi

apt-get update
apt-get -y install omxplayer
chmod a+rw /dev/vchiq

read -p "Please select default output: [A]udio jack | [h]dmi" output
if [[ -z "$output" ]] || [[ $output == "A" ]] || [[ $output == "a" ]]; then
  amixer cset numid=3 1
elif [[ -z "$output" ]] || [[ $output == "h" ]] || [[ $output == "H" ]]; then
  amixer cset numid=3 2
else 
  echo "invalid answer. setting to automatic."
  amixer cset numid=3 0
fi

chmod a+rw /dev/vchiq

read -p "Enter path to a file to test. Leave emtpy for example file: " file2play

if [ -z "$file2play" ];
then
  wget https://goo.gl/XJuOUW -O example.mp3 --no-check-certificate
  omxplayer example.mp3 
else
  omxplayer $file2play
fi