使用SHELL開發的CPU空閑率外掛程式

#!/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