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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