Shell Script to Parse Daily Log Files.

Going through different log files can be a pain, but here’s a simple script that parses today’s logs from different files into a single file, in this case we extract today’s logs from messages, auth.log, syslog. Finally, we send them through email. Don’t forget to make the file executable!… Logparser can be downloaded from here

#!/bin/bash
#author jorge
#purpose: extracting daily log entries from multiple log files
 
LOG1=/var/log/messages
LOG2=/var/log/auth.log
LOG3=/var/log/syslog
MYDATE=`date +%b\ %d`
OUTPUTLOG=`date +%F`.dailylog
EMAIL=btuser
 
for LOG in $LOG{1,2,3}
do
        #if file exist and is not empty then process
        if [ -e $LOG ] && [ -s $LOG ]; then
                echo $LOG BEGIN >> $OUTPUTLOG
                #only grabbing todays log out of file
                grep -E "$MYDATE" $LOG >> $OUTPUTLOG 2>/dev/null
                echo $LOG END >> $OUTPUTLOG
                echo >> $OUTPUTLOG
        fi
done
 
#email output
cat $OUTPUTLOG | mail -s "daily logs `date +%F`" $EMAIL 2>/dev/null
 
#END
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