Script on Runlevel

Wish to add a new service to start when the machine boots user should add the necessary script to the directory /etc/init.d/.

• Write a Script for that need to know any programming language #cat >{scriptname}.
• Set permission for that scriptname #chmod 777 {scriptname}, So that every usermode it will run.

After this we can add the script to runlevel by 2 way automatic or manually.

Automatic Way

• #update-rc.d {fulllocation/scriptname} default
  or
• #update-rc.d {fulllocation/scriptname} start 46 2 3 4 5 stop 48 0 1 6

it will automatically updated and start/stop from next booting time. Here 46 & 48 is priority of process in boot up time (0 is first priority and 99 is least priority).

Manually way

• Copy Script to /etc/init.d.
  #cp {fulllocation/scriptname} /etc/init.d
• Create softlink to choosen Runlevel's.
  #ln-s /etc/init.d/{scriptname} /etc/rc0.d/K48{scriptname}
  #ln-s /etc/init.d/{scriptname} /etc/rc1.d/S46{scriptname}
  #ln-s /etc/init.d/{scriptname} /etc/rc2.d/S46{scriptname}
  #ln-s /etc/init.d/{scriptname} /etc/rc3.d/S46{scriptname}
  #ln-s /etc/init.d/{scriptname} /etc/rc4.d/S46{scriptname}
  #ln-s /etc/init.d/{scriptname} /etc/rc5.d/S46{scriptname}
  #ln-s /etc/init.d/{scriptname} /etc/rc6.d/K48{scriptname}