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chapter19/uptime_loadmon.ksh

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+#!/bin/ksh
+#
+# SCRIPT: uptime_loadmon.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/26/2007
+# REV: 1.0.P
+# PLATFORM: AIX, HP-UX, Linux, and Solaris
+#
+# PURPOSE: This shell script uses the "uptime" command to
+#          extract the most current load average data. There
+#          is a special need in this script to determine 
+#          how long the system has been running since the
+#          last reboot. The load average field "floats" 
+#          during the first 24 hours after a system restart.
+#
+# set -x # Uncomment to debug this shell script
+# set -n # Uncomment to check script syntax without any execution
+#
+###################################################
+############# DEFINE VARIABLES HERE ###############
+###################################################
+
+SECONDS=30
+INTERVAL=2
+MAXLOAD=2.00
+typeset -i INT_MAXLOAD=$MAXLOAD
+
+# Find the correct field to extract based on how long
+# the system has been up, or since the last reboot.
+
+if $(uptime | grep day | grep min >/dev/null)
+then
+     FIELD=11
+elif $(uptime | grep day | grep hrs >/dev/null)
+then
+     FIELD=11
+elif $(uptime | grep day >/dev/null)
+then
+     FIELD=10
+elif $(uptime | grep min >/dev/null)
+then
+     FIELD=9
+else
+     FIELD=8
+fi
+
+###################################################
+######## BEGIN GATHERING STATISTICS HERE ##########
+###################################################
+
+echo "\nGathering System Load Average using the \"uptime\" command\n"
+
+# This next command statement extracts the latest 
+# load statistics no matter what the UNIX flavor is.
+
+LOAD=$(uptime | sed s/,//g | awk '{print $'$FIELD'}')
+
+# We need an integer representation of the $LOAD
+# variable to do the test for the load going over 
+# the set threshold defince by the $INT_MAXLOAD
+# variable
+
+typeset -i INT_LOAD=$LOAD
+
+# If the current load has exceeded the threshold then 
+# issue a warning message. The next step always shows
+# the user what the current load and threshold values
+# are set to.
+
+((INT_LOAD >= INT_MAXLOAD)) && echo "\nWARNING: System load has \
+reached ${LOAD}\n" 
+
+echo "\nSystem load value is currently at ${LOAD}"
+echo "The load threshold is set to ${MAXLOAD}\n"
+
+