使用shell脚本进行服务器系统监控——系统负载监控（2）

#!/bin/ksh

SECS=30  # Defines the number of seconds for each sample
INTERVAL=10 # Defines the total number of sampling intervals
OS=$(uname) # Defines the UNIX flavor

###################################################
##### SETUP THE ENVIRONMENT FOR EACH OS HERE ######
###################################################

# These "F-numbers" point to the correct field in the
# command output for each UNIX flavor.

case $OS in
AIX|HP-UX|SunOS)  
       F1=2
       F2=3
       F3=4
       F4=5
       echo "\nThe Operating System is $OS\n"
       ;;
Linux)
       F1=3
       F2=4
       F3=5
       F4=6
       echo "\nThe Operating System is $OS\n"
       ;;
*) echo "\nERROR: $OS is not a supported operating system\n"
   echo "\n\t...EXITING...\n"
   exit 1
   ;;
esac

###################################################
######## BEGIN GATHERING STATISTICS HERE ##########
###################################################

echo "Gathering CPU Statistics using sar...\n"
echo "There are $INTERVAL sampling periods with"
echo "each interval lasting $SECS seconds"
echo "\n...Please wait while gathering statistics...\n"

# This "sar" command take $INTERVAL samples, each lasting
# $SECS seconds. The average of this output is captured.

sar $SECS $INTERVAL | grep Average \
          | awk '{print $'$F1', $'$F2', $'$F3', $'$F4'}' \
          | while read FIRST SECOND THIRD FOURTH
do
      # Based on the UNIX Flavor, tell the user the
      # result of the statistics gathered.

      case $OS in
      AIX|HP-UX|SunOS)
            echo "\nUser part is ${FIRST}%"
            echo "System part is ${SECOND}%"
            echo "I/O wait state is ${THIRD}%"
            echo "Idle time is ${FOURTH}%\n"
            ;;
      Linux)
            echo "\nUser part is ${FIRST}%"
            echo "Nice part is ${SECOND}%"
            echo "System part is ${THIRD}%"
            echo "Idle time is ${FOURTH}%\n"
            ;;
      esac
done