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# vi /opt/scripts/os-log-alert.sh
#!/bin/bash
#Set the variable which equal to zero
prev_count=0
count=$(grep -i "`date --date='yesterday' '+%b %e'`" /var/log/messages | egrep -wi 'warning|error|critical' | wc -l)
if [ "$prev_count" -lt "$count" ] ; then
# Send a mail to given email id when errors found in log
SUBJECT="WARNING: Errors found in log on "`date --date='yesterday' '+%b %e'`""
# This is a temp file, which is created to store the email message.
MESSAGE="/tmp/logs.txt"
TO="wbaiked@baiked.com"
echo "ATTENTION: Errors are found in /var/log/messages. Please Check with Linux admin." >> $MESSAGE
echo "Hostname: `hostname`" >> $MESSAGE
echo -e "\n" >> $MESSAGE
echo "+------------------------------------------------------------------------------------+" >> $MESSAGE
echo "Error messages in the log file as below" >> $MESSAGE
echo "+------------------------------------------------------------------------------------+" >> $MESSAGE
grep -i "`date --date='yesterday' '+%b %e'`" /var/log/messages | awk '{ $3=""; print}' | egrep -wi 'warning|error|critical' >> $MESSAGE
mail -s "$SUBJECT" "$TO" < $MESSAGE
#rm $MESSAGE
fi
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