cpuload.sh

   1 #!/bin/sh
   2 ##
   3 ## Displays the CPU load.
   4 ## By Michal Nazareicz (mina86/AT/mina86.com)
   5 ## Released to Public Domain
   6 ##
   7 ## This is part of Tiny Applications Collection
   8 ##   -> http://tinyapps.sourceforge.net/
   9 ##
  10
  11 if [ "X$1" = X-h ] || [ "X$1" = "X--help" ]; then
  12         cat <<EOF
  13 usage: ${0##*/} [ -n | --nice ]
  14     -n --nice  includes nice value
  15 EOF
  16 fi
  17
  18
  19 if [ "X$1" = X-n ] || [ "X$1" = "X--nice" ]; then
  20         nice=true
  21 else
  22         nice=false
  23 fi
  24
  25
  26 while true; do
  27         head -n 1 /proc/stat
  28         sleep 1 || exit
  29 done | while true; do
  30         read _ a b c d _
  31         if $nice; then
  32                 load=$(( a + b + c ))
  33                 total=$(( load + d ))
  34         else
  35                 load=$(( a + c ))
  36                 total=$(( load + b + d ))
  37         fi
  38
  39         if [ -z "$ototal" ] || [ x"$total" = x"$ototal" ]; then
  40                 cpuload=0
  41         else
  42                 cpuload=$((10000 * (load-oload) / (total-ototal)))
  43         fi
  44
  45         printf " %3d.%02d%%\r" $((cpuload / 100)) $((cpuload % 100))
  46
  47         ototal=$total
  48         oload=$load
  49         sleep 1
  50 done