#!/usr/bin/bash

FAN_DIR=/sys/devices/platform/applesmc.768
MAX_FAN=$(cat $FAN_DIR/fan1_max)
CURR_FAN=$(cat $FAN_DIR/fan1_output)

ICON_FAN=""
FAN_P=$(echo - | awk -v max="$MAX_FAN" -v curr="$CURR_FAN" '{printf "%1.0f\n", (curr / max)*100}')

echo "$ICON_FAN $FAN_P%"