/etc/init.d/dropbox

dropbox

#!/bin/sh

# /etc/init.d/dropbox
### BEGIN INIT INFO
# Provides:          dropbox
# Required-Start:    $network $syslog $remote_fs
# Required-Stop:     $network $syslog $remote_fs
# Should-Start:      $named $time
# Should-Stop:       $named $time
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start and stop the dropbox daemon for debian/ubuntu
# Description:       Dropbox daemon for linux
### END INIT INFO

DROPBOX_USERS="user1 user2 user3"
start() {
    echo "Starting dropbox..."
    for dbuser in $DROPBOX_USERS; do
	echo -n "\t for user $dbuser: "
	sudo -u $dbuser /usr/bin/dropbox start
    done
}

stop() {
    echo "Stopping dropbox..."
    for dbuser in $DROPBOX_USERS; do
	echo -n "\t for user $dbuser: "
	sudo -u $dbuser /usr/bin/dropbox stop
    done
}

status() {
    for dbuser in $DROPBOX_USERS; do
	echo -n "dropboxd for USER $dbuser: "
	sudo -u $dbuser /usr/bin/dropbox status
    done
}


case "$1" in
  start)
    start
    ;;

  stop)
    stop
    ;;

  restart|reload|force-reload)
    stop
    start
    ;;

  status)
    status
    ;;

  *)
    echo "Usage: /etc/init.d/dropbox {start|stop|reload|force-reload|restart|status}"
    exit 1

esac

exit 0

Place this file into /etc/init.d/dropbox. Then

sudo chmod +x /etc/init.d/dropbox
sudo update-rc.d dropbox defaults

It will automatically run dropbox daemon for user1 user2 user3.