UNIX for Beginners Questions & Answers

#!/bin/bash
#Author: *******************
#Description:  This script will return the following set of system information:

EMAIL='*************'
function sysstat {
echo -e "
********************************************************************
    Health Check Report (CPU,Process,Disk Usage, Memory)
********************************************************************


Hostname         : `hostname`
Kernel Version   : `uname -r`
Uptime           : `uptime | sed 's/.*up \([^,]*\), .*/\1/'`
Last Reboot Time : `who -b | awk '{print $3,$4}'`
Cluster Utilization:
`df -h /path`


********************************************************************
CPU Load - >
*********************************************************************
"
MPSTAT=`which mpstat`
MPSTAT=$?
if [ $MPSTAT != 0 ]
then
        echo "NIL"
else
echo -e ""
LSCPU=`which lscpu`
LSCPU=$?
if [ $LSCPU != 0 ]
then
        RESULT=$RESULT" lscpu required to producre acqurate reults"
else
cpus=`lscpu | grep -e "^CPU(s):" | cut -f2 -d: | awk '{print $1}'`
i=0
while [ $i -lt $cpus ]
do
        echo "CPU$i : `mpstat -P ALL | awk -v var=$i '{ if ($3 == var ) print $4 }' `"
        let i=$i+1
done
fi
echo -e "
Load Average   : `uptime | awk -F'load average:' '{ print $2 }' | cut -f1 -d,`

Health Status : `uptime | awk -F'load average:' '{ print $2 }' | cut -f1 -d, | awk '{if ($1 > 2) print "Unhealthy"; else if ($1 > 1) print "Caution"; else print "Normal"}'`
"
fi
echo -e "
*********************************************************************
                             Process
*********************************************************************

=> Top memory using processs/application

PID %MEM RSS COMMAND
`ps aux | awk '{print $2, $4, $6, $11}' | sort -k3rn | head -n 10`

=> Top CPU using process/application
`top b -n1 | head -17 | tail -11`

*********************************************************************
Disk Usage - > Threshold < 70 Normal > 75% Caution > 80% Unhealthy
*********************************************************************
"
df -Pkh | grep -v 'Filesystem' > /tmp/df.status
while read DISK
do
        LINE=`echo $DISK | awk '{print $1,"\t",$6,"\t",$5," used","\t",$4," free space"}'`
        echo -e $LINE
        echo
done < /tmp/df.status
echo -e "

Health Status"
echo
while read DISK
do
        USAGE=`echo $DISK | awk '{print $5}' | cut -f1 -d%`
        if [ $USAGE -ge 95 ]
USAGE=`echo $DISK | awk '{print $5}' | cut -f1 -d%`
        if [ $USAGE -ge 95 ]
        then
                STATUS='Unhealty'
        elif [ $USAGE -ge 90 ]
        then
                STATUS='Caution'
        else
                STATUS='Normal'
        fi

        LINE=`echo $DISK | awk '{print $1,"\t",$6}'`
        echo -ne $LINE "\t\t" $STATUS
        echo
done < /tmp/df.status
rm /tmp/df.status
TOTALMEM=`free -m | head -2 | tail -1| awk '{print $2}'`
TOTALBC=`echo "scale=2;if($TOTALMEM<1024 && $TOTALMEM > 0) print 0;$TOTALMEM/1024"| bc -l`
USEDMEM=`free -m | head -2 | tail -1| awk '{print $3}'`
USEDBC=`echo "scale=2;if($USEDMEM<1024 && $USEDMEM > 0) print 0;$USEDMEM/1024"|bc -l`
FREEMEM=`free -m | head -2 | tail -1| awk '{print $4}'`
FREEBC=`echo "scale=2;if($FREEMEM<1024 && $FREEMEM > 0) print 0;$FREEMEM/1024"|bc -l`
TOTALSWAP=`free -m | tail -1| awk '{print $2}'`
TOTALSBC=`echo "scale=2;if($TOTALSWAP<1024 && $TOTALSWAP > 0) print 0;$TOTALSWAP/1024"| bc -l`
USEDSWAP=`free -m | tail -1| awk '{print $3}'`
USEDSBC=`echo "scale=2;if($USEDSWAP<1024 && $USEDSWAP > 0) print 0;$USEDSWAP/1024"|bc -l`
FREESWAP=`free -m |  tail -1| awk '{print $4}'`
FREESBC=`echo "scale=2;if($FREESWAP<1024 && $FREESWAP > 0) print 0;$FREESWAP/1024"|bc -l`

echo -e "
*********************************************************************
                     Memory
*********************************************************************

=> Physical Memory

Total\tUsed\tFree\t%Free

${TOTALBC}GB\t${USEDBC}GB \t${FREEBC}GB\t$(($FREEMEM * 100 / $TOTALMEM  ))%

=> Swap Memory

Total\tUsed\tFree\t%Free
                                                              

${TOTALSBC}GB\t${USEDSBC}GB\t${FREESBC}GB\t$(($FREESWAP * 100 / $TOTALSWAP  ))%
"
}
FILENAME="health-`hostname`-`date +%m%d%y`-`date +%H%M`.txt"
sysstat > $FILENAME
echo -e "Reported file $FILENAME generated in current directory." $RESULT
if [ "$EMAIL" != '' ]
then
        STATUS=`which mail`
        if [ "$?" != 0 ]
        then
                echo "The program 'mail' is currently not installed."
        else
                cat $FILENAME | mail -s "$FILENAME" $EMAIL
        fi