# cpu load

# Grab previous stats
cache=/tmp/cpuloadcache


[ ! -f /tmp/cpuloadcache ] || touch $cache


curr_stats=($(head -n 1 /proc/stat))



prev_stats=$(cat /tmp/cpuloadcache)
prev_stats=($prev_stats)

# Caculate current stats

curr_sum="${curr_stats[@]:1}"
curr_sum=$((${curr_sum// /+}))


# Caculate previous stats

prev_sum="${prev_stats[@]:1}"
prev_sum=$((${prev_sum// /+}))



# Caculate Delta
delta=$((curr_sum - prev_sum))


# Calculate IDle
idle=$((curr_stats[4] - prev_stats[4]))


# calculate usage by subtracting delat from idle
used=$((delta - idle))

cpu_usage=$((100 * used / delta))



echo "${curr_stats[@]}" > /tmp/cpuloadcache
echo $cpu_usage"%"