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Re: guidance with a realtime log reader

by rodion (Chaplain)
on Aug 29, 2013 at 21:42 UTC ( [id://1051514]=note: print w/replies, xml ) Need Help??


in reply to guidance with a realtime log reader

Don't forget that you will need to provide for stopping and restarting your script at the the time when the log file turns over to a new copy. (On the log file side, the change is often done using "rotate".) Without that, your tail command might be listening to a log that has been renamed from "logfile" to "logfile.0". You'll be listening it logfile.0, the inode that you opened, which is no longer being written to, and nothing is listening to the new day's copy of "logfile".

Just a caution.

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Re^2: guidance with a realtime log reader
by socalheel (Initiate) on Aug 30, 2013 at 16:36 UTC
    Thank you so much for responding ... I'll try to work on it this weekend to convert from bash to perl. And good call with the log rotating. :) If anyone is interested, here is my bash script: 
    #!/bin/bash

string="connection_input: conn=11"

tail -n 0 -F /var/log/ldap.log | \
while read LINE
do
echo "$LINE" | grep -q $string
if [ $? = 0 ]
then
echo -e "$string found on $HOSTNAME" | mail -s "LDAP authentication on
+ $(hostname)" teamsupport@yourdomain.com
fi
done

    [download]
    But I have to start it with a no hangup script 
    #!/bin/bash

nohup ./ldap_log_reader.sh 0<&- &>/dev/null &

    [download]
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