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How to end the bash script using commands in bash not manually by pressing ctrl+c

I want to end the bash script when the file read by the bash Script is over. Actually I am making a project of automation of Universal Testing machine using Sensors. I have done the programming of it and I am Putting my code in the following link http://bit.ly/13s4WBu.

Now the problem is when I am running the script ttyUSB.sh it does not end automatically whent the break condition is applied to the ttyusb0 in arduino. To know more about arduino visit the following page http://en.wikipedia.org/wiki/Arduino

Now I need the help so that I can end the bash script automatically.

If you need more help then I can also give that.

Code:

exit

Will end a bash script.

Code:

exit $

Will end a bash script with the status of the last command.

Cheers