tether

#!/bin/bash

openTether="am start -n com.android.settings/.TetherSettings"
pause="sleep 1"
inputKey="input keyevent KEYCODE_"

function log {
  echo "$1" >> /tmp/tether.log
}

date=`date`
output=`adb shell "$openTether; $pause; ${inputKey}DPAD_UP; $pause; ${inputKey}ENTER" 2>&1`

log
log "[$date]"
log "$output"

# To run this script every time you connect your device,
# put the following line in e.g. /etc/udev/rules.d/tether.rules
#
# ACTION=="add", ATTRS{idVendor}=="dead", ATTRS{idProduct}=="beef", RUN+="/path/to/tether"
#
# You can get the vendor:product id when the device is in debug (non-tethering) mode
# by running `lsusb`. You'll get some output with a line like:
#
# Bus 001 Device 044: ID dead:beef Google Inc. Nexus 4 (debug)