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chapter19/uptime_loadmon.bash

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+#!/bin/bash
+#
+# SCRIPT: uptime_loadmon.bash
+# AUTHOR: Randy Michael
+# DATE: 12/16/2007
+# REV: 1.0.P
+# PLATFORM: AIX, HP-UX, Linux, OpenBSD, and Solaris
+#
+# PURPOSE: This shell script uses the "uptime" command to
+#          extract the most current load average data, which
+#          in this case is the average number of jobs in the
+#          run queue. 
+#
+# set -x # Uncomment to debug this shell script
+# set -n # Uncomment to check script syntax without any execution
+#
+###################################################
+############# DEFINE VARIABLES HERE ###############
+###################################################
+
+MAXLOAD=2.00
+
+# Extract the interger and decimal parts of $MAXLOAD
+MAXLOAD_INT=$(echo $MAXLOAD | awk -F '.' '{print $1}')
+MAXLOAD_DEC=$(echo $MAXLOAD | awk -F '.' '{print $2}')
+
+# Check the UNIX flavor for the correct uptime values
+# AIX specifies load as the last 5, 10, and 15 minutes.
+# The other UNIX flavors specifies the load in the last
+# 1, 5, and 15 minutes.
+
+case $(uname) in
+AIX)     L1=5
+         L2=10
+         L3=15
+         ;;
+  *)
+         L1=1
+         L2=5
+         L3=15
+         ;;
+esac
+
+
+###################################################
+# DEFINE FUNCTIONS HERE
+###################################################
+
+function get_max
+{
+# This function return the number of auguments
+# presented to the function
+# 
+(($# == 0)) && return -1
+echo $#
+}
+
+###################################################
+#  BEGINNING OF MAIN
+###################################################
+
+echo -e "\nGathering System Load Average using the \"uptime\" command\n"
+
+# This next command statement extracts the latest 
+# load statistics no matter what the UNIX flavor is.
+
+NUM_ARGS=$(get_max $(uptime)) # Get the total number of fields in uptime output
+
+((NUM_ARGS == -1)) && echo "ERROR: get_max Function Error...EXITING..."\
+                   && exit 2
+
+
+# Extract the data for the last 5, 10, and 15 minutes
+
+ARGM2=$(((NUM_ARGS - 2)))  # Subtract 2 from the total
+ARGM1=$(((NUM_ARGS - 1)))  # Subtract 1 from the total
+ARGM=$NUM_ARGS             # Last value in string
+
+uptime | sed s/,//g | awk '{print $'$ARGM2', $'$ARGM1', $'$ARGM'}' \
+       | while read LAST5 LAST10 LAST15
+do
+    echo $LAST5 | awk -F '.' '{print $1, $2}' \
+    | while read INT DEC
+    do
+       if (( INT > MAXLOAD_INT )) 
+       then
+           echo -e "\nWARNING: System load has \
+reached ${LAST5}\n"
+       fi
+
+       echo "System load average for the last $L1 minutes is $LAST5"
+       echo "System load average for the last $L2 minutes is $LAST10"
+       echo "System load average for the last $L3 minutes is $LAST15"
+       echo  -e "\nThe load threshold is set to ${MAXLOAD}\n"
+    done
+done
+