Originally published at: http://www.howtogeek.com/167425/how-to-setup-wi-fi-on-your-raspberry-pi-via-the-command-line/
You configured your headless Raspberry Pi just the way you want it, it’s settled in and running smoothly, but suddenly you want to move it away from its Ethernet tether with a Wi-Fi module. Skip hooking it back up to all the peripherals and quickly add in Wi-Fi support from the command line.
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