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chapter18/linux_swap_mon.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: linux_swap_mon.ksh
+#
+# AUTHOR: Randy Michael
+# DATE: 5/31/2007
+# REV: 1.1.P
+# 
+# PLATFORM: Linux Only
+#
+#
+# PURPOSE: This shell script is used to produce a report of
+#          the system's paging space statistics including:
+#
+#       Total paging space in MB, MB of Free paging space,
+#       MB of Used paging space, % of paging space Used, and
+#       % of paging space Free
+#
+# REV LIST:
+#
+#
+# set -x # Uncomment to debug this shell script
+# set -n # Uncomment to check command syntax without any execution
+#
+###########################################################
+################ DEFINE VARIABLES HERE ####################
+
+THISHOST=$(hostname)   # Host name of this machine
+PC_LIMIT=65            # Upper limit of Swap space percentage
+                       # before notification 
+
+###########################################################
+################ INITIALIZE THE REPORT ####################
+
+echo "\nSwap Space Report for $THISHOST\n"
+date
+
+###########################################################
+############# CAPTURE AND PROCESS THE DATA ################
+
+free -m | grep -i swap | while read junk SW_TOTAL SW_USED SW_FREE
+do
+
+# Use the bc utility in a here document to calculate
+# the percentage of free and used swap space.
+
+PERCENT_USED=$(bc <<EOF
+scale=4
+($SW_USED / $SW_TOTAL) * 100 
+EOF
+) 
+
+PERCENT_FREE=$(bc <<EOF
+scale=4
+($SW_FREE / $SW_TOTAL) * 100
+EOF
+)
+
+     # Produce the rest of the paging space report:
+     echo "\nTotal Amount of Swap Space:\t${SW_TOTAL}MB"
+     echo "Total KB of Swap Space Used:\t${SW_USED}MB"
+     echo "Total KB of Swap Space Free:\t${SW_FREE}MB"
+     echo "\nPercent of Swap Space Used:\t${PERCENT_USED}%"
+     echo "\nPercent of Swap Space Free:\t${PERCENT_FREE}%"
+
+     # Grap the integer portion of the percent used to 
+     # test for the over limit threshold
+
+     INT_PERCENT_USED=$(echo $PERCENT_USED | cut -d. -f1)
+
+     if (( PC_LIMIT <= INT_PERCENT_USED ))
+     then
+          tput smso
+          echo "\n\nWARNING: Paging Space has Exceeded the ${PC_LIMIT}% Upper Limit!\n"
+          tput rmso
+     fi
+
+done 
+
+echo "\n"