scripts/_cpu_usage

   1 #!/bin/bash
   2 # Found on WWW
   3
   4 [ "$1" = "-n" ] && noverb=1
   5
   6 # Read /proc/stat file (for first datapoint)
   7 read cpu user nice system idle iowait irq softirq steal guest < /proc/stat
   8
   9 # compute active and total utilizations
  10 cpu_active_prev=$((user+system+nice+softirq+steal))
  11 cpu_total_prev=$((user+system+nice+softirq+steal+idle+iowait))
  12
  13 usleep 50000
  14
  15 # Read /proc/stat file (for second datapoint)
  16 read cpu user nice system idle iowait irq softirq steal guest < /proc/stat
  17
  18 # compute active and total utilizations
  19 cpu_active_cur=$((user+system+nice+softirq+steal))
  20 cpu_total_cur=$((user+system+nice+softirq+steal+idle+iowait))
  21 # compute CPU utilization (%)
  22 cpu_util=$(( 100 * (cpu_active_cur - cpu_active_prev) / (cpu_total_cur - cpu_total_prev) ))
  23
  24 if [ $noverb ]; then
  25     printf "%s\n" "$cpu_util"
  26 else
  27     printf "Current CPU Utilization: %s\n" "$cpu_util"
  28 fi
  29
  30 exit 0