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Dell vostro 2520 switch off bluetooth

I've got vostro 2520. The thing that annoys me is that by default it switches on bluetooth as addition to wifi & i have to switch it off after every reboot :(
Can i save the state switched of for bluetooth as a default? this is to prolong battery life.
I didn't find an answer to this googling. Could you help me?

Update 1
As told i edited the file (name in the answer) but uncommented other lines. in the end this is my file:

\!/bin/sh -e
rfkill block bluetooth
exit 0