使用shell脚本进行服务器系统监控——系统负载监控（3）

#!/bin/ksh

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"