Check MacBook battery with command line

batt.sh

#! /bin/sh
#
# Check battery on macbook air 2017
#

UNAME=$(uname)

if [ "$UNAME" = "Linux" ]; then

  # find a battery
  CMD="upower -e"
  echo $CMD
  OUT=$($CMD)
  BAT=$(echo "$OUT" | grep 'BAT')

  CMD="upower -i $BAT"
  echo -e "$CMD\n"
  OUT=$($CMD)

  PERCENT=$(echo "$OUT" | grep -Eo 'percentage:.+')
  echo $PERCENT

  TIME=$(echo "$OUT" | grep -Eo 'time to empty:.+')
  echo $TIME

  CYCLE=$(echo "$OUT" | grep -Eo 'charge-cycles:.+')
  echo $CYCLE

else
  echo "pmset -g batt\n"
  pmset -g batt | grep -Eo '\d{1,3}%.*'

  printf "cycle: "
  system_profiler SPPowerDataType | grep "Cycle Count" | awk '{print $3}'
fi