This is a POSIX compatible init script for jclouds

jclouds_posix.sh

#!/bin/sh
export INSTANCE_NAME="test"
export INSTANCE_HOME="/tmp/test"
export LOG_DIR="$INSTANCE_HOME"
forget () {
	mkdir -p "$LOG_DIR"
	if test ! -f "$LOG_DIR/pid" ; then
		nohup "$INSTANCE_HOME/$INSTANCE_NAME.sh" > "$LOG_DIR/stdout.log" 2> "$LOG_DIR/stderr.log" & 
		echo $! > "$LOG_DIR/pid"
	else 
		echo "$INSTANCE_NAME" already running pid $(cat "$LOG_DIR/pid")
		return 1
	fi
}
stream () {
	offset=$(du -b "$1" | cut -f1)
	head -q -c "$offset" "$1"
	offset=$(expr "$offset" + 1 )
	while kill -0 $(cat "$LOG_DIR/pid") >/dev/null 2>&1
	do
		sleep 0.1
		cursize=$(du -b "$1" | cut -f1)
		tail -q -c "+$offset" "$1" | head -q -c $(expr "$cursize" + 1 - "$offset")
		offset=$(expr "$cursize" + 1 )
	done
	tail -q -c "+$offset" "$1"
	exit $(cat "$LOG_DIR/rc")
}
case $1 in
init)
	mkdir -p $INSTANCE_HOME

	# create runscript header
	cat > "$INSTANCE_HOME/test.sh" <<- "END_OF_JCLOUDS_SCRIPT"
	#!/bin/sh
	export PATH=/usr/ucb/bin:/bin:/sbin:/usr/bin:/usr/sbin
	export INSTANCE_NAME="test"
	export INSTANCE_HOME="/tmp/test"
	export LOG_DIR="$INSTANCE_HOME"
END_OF_JCLOUDS_SCRIPT

	# add desired commands from the user
	cat >> "$INSTANCE_HOME/test.sh" <<- "END_OF_JCLOUDS_SCRIPT"
	cd $INSTANCE_HOME
	rm -f $INSTANCE_HOME/rc
	trap 'echo $?>$INSTANCE_HOME/rc && rm -f "$LOG_DIR/pid"' 0 1 2 3 15
	##### Start of my little test script
	i=0
	max=500
	while [ $i -lt $max ]
	do
		sleep 0.1
		echo $i
		true $((i=i+1))
	done
	exit 0
	##### End of my little test script
END_OF_JCLOUDS_SCRIPT

	# add runscript footer
	cat >> $INSTANCE_HOME/test.sh <<- "END_OF_JCLOUDS_SCRIPT"
	exit $?
END_OF_JCLOUDS_SCRIPT

	chmod u+x "$INSTANCE_HOME/test.sh"
	;;
status)
	pid=$(cat "$LOG_DIR/pid") || exit 1
	kill -0 $pid || exit 1
	echo $pid
	;;
stop)
	FOUND_PID=$(cat "$LOG_DIR/pid") || exit 1
	kill -0 $FOUND_PID || exit 1
	echo stopping $FOUND_PID
	kill -9 $FOUND_PID && rm -f "$LOG_DIR/pid"
	;;
start)
	forget || exit 1
	;;
stdout)
	cat "$LOG_DIR/stdout.log"
	;;
stderr)
	cat "$LOG_DIR/stderr.log"
	;;
exitstatus)
	test -f "$LOG_DIR/rc" && cat "$LOG_DIR/rc"
	;;
tail)
	tail "$LOG_DIR/stdout.log"
	;;
tailerr)
	tail "$LOG_DIR/stderr.log"
	;;
stream)
	stream "$LOG_DIR/stdout.log"
	;;
streamerr)
	stream "$LOG_DIR/stderr.log"
	;;
run)
	mkdir -p "$LOG_DIR"
	echo $$ > "$LOG_DIR/pid"
	"$INSTANCE_HOME/$INSTANCE_NAME.sh" 
	;;
esac 
exit $?