Add Programs In Ubuntu Bootup/Startup

1. write command to be execute and save it as .sh file under the /etc/init.d folder
eg>    . /home/mapserver/fgs/setenv.sh; fgs start

2. Create symbolic link 
    a. create symbolic link manually-
        sudo ln -s path_sorce_file  path_new_file
        eg> sudo ln -s /etc/init.d/fgs.sh /etc/rc0.d/fgs
        In manual way you have to create for all rc.d folders ie. for rc0.d,rc1.d,rc2.d,rc3.d,rc4.d,rc5.d,rc6.d,rcS.d

    b. create symbolic link automatically-
       sudo update rc.d file_name defaults
eg>  sudo update rc.d fgs.sh defaults