I have written a bash script that calls several other programs and executes a bunch of commands. I copied this script to the /etc/init.d and updated the run levels with default 100. Now I unable to move forward because the script is executing & programs are running. I unable to access the terminal also.

Pressing Ctrl + C sometimes doesn't working, I think because sometimes the script is executing another program, and for some reason the kill signal doesn't work.

Is there any option to kill the script ??
Please any one tell me how to kill the script.

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Depends on the system...Depends on what is actually going on...

Since you indicate it is running at 100 (which doesn't quite make sense - start levels are only two digits long...).

If it happens to be a systemd based distribution, have you tried doing a secure shell login? If you can you then you can go to root and stop it.

If you can't, your only alternative is to crash the system, then boot in single user mode and remove the script.

Boot a live CD, mount your drive, pull the script back out of init.d, and then start the OS back up.