a little bluetooth script

#!/bin/bash

input=$1
MAC=[insert mac address here]

turn_on() {
  local output
  local len
  local userinput

  coproc bluetoothctl

  echo "scan on" >&${COPROC[1]}
  sleep 3
  pair_bluetooth
  connect_bluetooth

  echo "exit" >&${COPROC[1]}
}
pair_bluetooth() {
  echo "pair ${MAC}" >&${COPROC[1]}
  echo "paired (y/n)?  "
  read userinput

  while [[ ${userinput} == "n" ]]; do
    echo "pair ${MAC}" >&${COPROC[1]}
    echo "paired (y/n)?  "
    read userinput
  done
}
connect_bluetooth() {
  echo "connect ${MAC}" >&${COPROC[1]}
  echo "connected (y/n)?  "
  read userinput

  while [[ ${userinput} == "n" ]]; do
    echo "connect ${MAC}" >&${COPROC[1]}
    echo "connected (y/n)?  "
    read userinput
  done
}


turn_off() {
  coproc bluetoothctl

  echo "disconnect ${MAC}" >&${COPROC[1]}
  sleep 2
  echo "remove ${MAC}" >&${COPROC[1]}
  sleep 1

  echo "exit" >&${COPROC[1]}
}


if [[ ${input} == "on" ]]; then
  turn_on
elif [[ ${input} == "off" ]]; then
  turn_off
else
  printf "Usage:  pairbuds.sh [on | off]\n"
fi