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chapter19/vmstat_loadmon.ksh

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+#!/bin/ksh
+#
+# SCRIPT: vmstat_loadmon.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/26/2002
+# REV: 1.0.P
+# PLATFORM: AIX, HP-UX, Linux, and Solaris
+#
+# PURPOSE: This shell script take two samples of the CPU
+#          usage using the "vmstat" command. The first set of
+#          data is an average since the last system reboot. The
+#          second set of data is an average over the sampling
+#          period, or $INTERVAL. The result of the data aquired
+#          during the sampling perion is shown to the user based
+#          on the UNIX operating system that this shell script is
+#          executing on. Different UNIX flavors have differing
+#          outputs and the fields vary too.
+#
+# REV LIST:
+#
+#
+# set -n # Uncomment to check the script syntax without any execution
+# set -x # Uncomment to debug this shell script
+#
+###################################################
+############# DEFINE VARIABLES HERE ###############
+###################################################
+
+SECONDS=300  # Defines the number of seconds for each sample
+INTERVAL=2   # Defines the total number of sampling intervals
+STATCOUNT=0  # Initialize a loop counter to 0, zero
+OS=$(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