cpuawk

BEGIN {
  getline < "/tmp/cpu-usage-cache"
  close("/tmp/cpu-usage-cache")
  prev_idle = $1
  prev_total = $2
  getline < "/proc/stat"
  close("/proc/stat")
  idle = $5
  total = 0
  for (i=2; i<=NF; i++)
    total += $i
  printf "%d", (1-(idle-prev_idle)/(total-prev_total))*100"%"
  printf "%d %d", idle, total > "/tmp/cpu-usage-cache"
}