使用shell脚本进行服务器系统监控——系统负载监控（4）

#!/bin/ksh

SECONDS=300 # Defines the number of seconds for each sample
INTERVAL=2 # Defines the total number of sampling intervals
STATCOUNT=0 # Initialize a loop counter to 0, zero
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) # AIX has four relative columns in the output
F1=14
F2=15
F3=16
F4=17

echo "/nThe Operating System is $OS/n"
;;
HP-UX) # HP-UX only has three relative columns in the output
F1=16
F2=17
F3=18
F4=1 # This "F4=1" is bogus and not used for HP-UX

echo "/nThe Operating System is $OS/n"
;;
Linux) # Linux only has three relative columns in the output
F1=14
F2=15
F3=16
F4=1 # This "F4=1" is bogus and not used for Linux

echo "/nThe Operating System is $OS/n"
;;
SunOS) # SunOS only has three relative columns in the output
F1=20
F2=21
F3=22
F4=1 # This "F4=1" is bogus and not used for SunOS

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 vmstat.../n"
echo "There are $INTERVAL sampling periods with"
echo "each interval lasting $SECONDS seconds"
echo "/n...Please wait while gathering statistics.../n"

# Use "vmstat" to monitor the CPU utilization and
# remove all lines that contain alphabetic characters
# and blank spaces. Then use the previously defined
# field numbers, for example F1=20,to point directly
# to the 20th position, for this example. The syntax
# for this techniques is ==> $'$F1', and points directly
# to the $20 positional parameter.

vmstat $SECONDS $INTERVAL | egrep -v '[a-zA-Z]|^$' /
| awk '{print $'$F1', $'$F2', $'$F3', $'$F4'}' /
| while read FIRST SECOND THIRD FORTH
do
if ((STATCOUNT == 1)) # Loop counter to get the second set
then # of data produces by "vmstat"

case $OS in # Show the results based on the UNIX flavor
AIX)
echo "/nUser part is ${FIRST}%"
echo "System part is ${SECOND}%"
echo "Idle part is ${THIRD}%"
echo "I/O wait state is ${FORTH}%/n"
;;
HP-UX|Linux|SunOS)
echo "/nUser part is ${FIRST}%"
echo "System part is ${SECOND}%"
echo "Idle time is ${THIRD}%/n"
;;
esac

fi
((STATCOUNT = STATCOUNT + 1)) # Increment the loop counter
done