2 of 4 added 199 characters in body

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
rc.local
rfkill block bluetooth
exit 0