使用SHELL开发的CPU空闲率插件

#!/bin/bash 

#=============================================== 

# Author        :        JC 

# Email         :        jiechao2013@gmail.com 

# ChangeLog     :        2013.5.4 

# 

# Description : Check the CPU-Utilization rate 

#=============================================== 

STATE_OK=0 

STATE_WARNING=1 

STATE_CRITICAL=2 

STATE_UNKNOWN=3  

cpu_idle=`top -b -n 1 | grep Cpu | awk '{print $5}' | cut -f 1 -d "."`  

PROGNAME=$(basename $0) 

RELEASE="Revision 1.2.0"

AUTHOR="(c) 2013 JC (jiechao2013@gmail.com)"

print_release() { 

    echo "$RELEASE $AUTHOR"

}                 

print_usage() { 

        echo ""

        echo "$PROGNAME $RELEASE - CPU Utilization rate check script for Nagios"

        echo ""

        echo "Usage: check_cpurate.sh"

        echo ""

        echo "  -v  check the version"

        echo ""

    echo "Usage: $PROGNAME"

    echo ""

    exit 0 

}                  

print_help() { 

        print_usage 

        echo ""

        echo "This plugin will check CPU Utilization rate  "

        echo ""

        exit 0 

}                  

while [ $# -gt 0 ]; do

    case "$1" in

        -v | --version) 

                print_release 

                exit $STATE_OK 

                shift 

                ;; 

*)   

echo "Unknown argument: $1"

            print_usage 

            exit $STATE_UNKNOWN 

            ;; 

        esac 

shift 

done 

case `uname` in

        Linux) 

PERCENT=$( bc<<<"scale=2;621/977"|tr '^.' ' ') 

cpu_idle=`top -b -n 1 | grep Cpu | awk '{print $5}' | cut -f 1 -d "."` 

if (("$cpu_idle"  < 95));then 

echo "OK- Utilization rate $cpu_idle (free:$PERCENT%) Free CPU"

exit $STATE_OK 

else

  echo "CRITICAL- CPU Utilization rate $cpu_idle ($PERCENT%) Free CPU"

exit $STATE_CRITICAL 

fi 

;; 

  *) 

echo "UNKNOWN: `uname` not yet supported by this plugin. Coming soon !"

exit $STATE_UNKNOWN 

;; 

esac

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