export PIDFILE=/var/run/${1}.pid
echo “$$” > “$PIDFILE”

anyway I guess the start script has to be a bit more complicated.
In fact, what happen if:

1) you starting twice the service? the script has to detect that the service is already started
2) what happen if the service crash or the script is killed? you have an unclean pidfile

this can be an alternative approach for the start

if ( set -o noclobber; echo “$$” > “$PIDFILE”) 2> /dev/null;
then
trap ‘rm -f “$PIDFILE”; exit $?’ INT TERM EXIT 
# starting the service in foreground here
 
rm -f “$PIDFILE” trap – INT TERM EXIT
else
echo “The service is already running with PID: $(cat $PIDFILE)”fi In this case if the process crash or the script is killed, the PIDFILE will be removed.
bye
Bruno