Shell Programming and Scripting

#!/bin/sh
integer CURCOUNT
LOGFILE=/var/opt/resmon/log/event.log

#Compare current count line with old count line in oldcount.txt
OLDCOUNT=`cat oldcount.txt | awk '{print $1}'`

CURCOUNT=`wc -l /var/opt/resmon/log/event.log | awk '{print $1}`

if [ "$CURCOUNT" = "$OLDCOUNT" ]; then
        echo "NO Change"
        exit
else

NEWLINES=`expr $CURCOUNT - $OLDCOUNT`

# Read and output new lines to diffline.txt
STARTLINE=`expr $OLDCOUNT + 1`
LASTLINE=$CURCOUNT

awk -v SL=$STARTLINE -v LL=$LASTLINE '
((NR >=SL) && (NR <=LL)) {print  $0}' /var/opt/resmon/log/event.log > diffline.txt

#Updates oldcount.txt with latest value
echo $CURCOUNT > oldcount.txt
exit
fi

sed -ne '/^---/p' -e '/Severity............: CRITICAL/,/^Description of Error/p' -e '/Severity............: MAJORWARNING/,/^Description of Er
ror/p' diffline.txt | sed -ne '/^Severity/p' -e '/^Summary/,/^Description of Error/p' | sed '/^Description/d' | sed '/^$/d' | sed 's/^[ \t]*/
/;s/[ \t]*$//' > diffline2.txt

sed -n '
:a
/Sev/ {
N
/Sev.*Sev/ !{
s/\n/ /
ta
}
P
D
}' diffline2.txt > diffline3.txt