Bash calculate CPU steal%

Example bash script to calculate CPU steal% on Linux

#!/bin/bash
# Adopted from http://stackoverflow.com/questions/26791240/how-to-get-percentage-of-processor-use-with-bash

# Read /proc/stat file (for first datapoint)
read cpu user nice system idle iowait irq softirq steal guest< /proc/stat

# compute active and total utilizations
cpu_steal_prev=$((steal))
cpu_total_prev=$((user+system+nice+softirq+steal+idle+iowait))

sleep 0.05

# Read /proc/stat file (for second datapoint)
read cpu user nice system idle iowait irq softirq steal guest< /proc/stat

# compute active and total utilizations
cpu_steal_cur=$((steal))
cpu_total_cur=$((user+system+nice+softirq+steal+idle+iowait))

# compute CPU steal (%)
if [ $(( cpu_steal_cur-cpu_steal_prev )) -eq 0 ]; then
  steal_pct=0
else
  steal_pct=$((100*( cpu_steal_cur-cpu_steal_prev ) / (cpu_total_cur-cpu_total_prev) ))
fi

printf " Current CPU Steal : %s\n" "$steal_pct"

exit 0