#!/bin/bash
   
   usage(){
           echo usage: `basename $0` `ls /etc/alsa/ -1 | sed -e 's:/etc/alsa/::g' -e 's/asound.//g'`
   }
   
   if [ -n $1 ] && [ -e /etc/alsa/asound.$1 ];
   then
           ln -sf /etc/alsa/asound.$1 /etc/asound.conf
   else
           usage
   fi