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I found the valid script for me. Thank you very much for your help. :D

The result still have error:

root@ubuntu:~# ./phan6.sh
88.5
./phan6.sh: line 5: [: 88.5: integer expression expected


Please check it for me.
Thank you very much.

#!/bin/bash
a=20
CPUIDLE=$(top -d 0.1 -n 2 | grep '^Cpu(s):'| tail -1 |awk '{print $5}'|sed 's/%.*//')
echo $CPUIDLE
if [ $CPUIDLE -lt $a ]
then
exit 1
else
exit 0
fi



When I...

I am using Ubuntu 9.04. I want to write a shell script to get the information about cpu idle from top command at the real time when i call it, compare cpu idle with 20 (20%), if cpu idle > 20 exit 1,...