A keepalive script for Mac OS X apps, which takes the process name of the app as its only argument; recursively executes every one second to ensure the target app is still running (it also sets the input volume of the device to maximum)

keepalive_process

# Continuously monitor the run state of an app
# identified by the specified name and
# launches the app if not running

while (true); do
ps_out=`ps -ef | grep $1 | grep -v 'grep' | grep -v $0`
result=$(echo $ps_out | grep "$1")
if [[ "$result" == "" ]]; then
    open -a /Applications/AVS\ Server.app/
osascript -e "set volume input volume 100"
    osascript <<END
  tell application "Finder"
    if exists application process "$1" then
      set visible of application process "$1" to false
    end if
  end tell
END
fi
sleep 1
done

To execute:
./keepalive_process [process name]