#!/bin/sh
#
# Use xset s $time to control the timeout when this will run.
#
if [ $# -lt 1 ];
  then
    printf "usage: %s cmd\n" "$(basename $0)" 2>&1
    exit 1
fi
cmd="$@"
while true
  do
    if [ $(xssstate -s) != "disabled" ];
      then
        tosleep=$(($(xssstate -t) / 1000))
        if [ $tosleep -le 0 ];
          then
            $cmd
        else
          sleep $tosleep
        fi
    else
      sleep 10
   fi
done