From: ert weerr (sun1sol@yahoo.com)
Date: Thu Jan 27 2005 - 17:46:22 EST
Guys,
> I have to write a script that online monitors a
> log file to check if a particular error message
> turns up there.
> The log file is quite big and I need to run some
> commands right after the message appears in the log.
> So, to grep for the message in every 1 second won't
> work, because at the time the script finished
> to grep the huge file some valuable seconds
> would elapse.
Many thanks to everyone for your invaluable help!!!
The world would be a harsh place without you guys!
====================================================
You can look at swatch and/or logcheck (or is it
checklog).
swatch is more for continual monitoring (taking more
immediate action), logcheck more for periodic.
logcheck tracks where it left off in the file and
seeks to that point before continuing, so it may have
the performance requirements you need.
====================================================
logsurfer, logcheker, etc.
====================================================
tail -f logfile | grep pattern |
while read line; do
echo found it: $line
#do other stuff
done
Run that as a daemon process. -f
====================================================
logbot
logsurfer
swatch
syslog-ng
jabber
and whatnot on freshmeat.net or sunfreeware.com. They
all have this similar functionality.
====================================================
#!/bin/ksh
tail -f logfile |
while read LINE; do
if echo $LINE | grep 'HELLO' >/dev/null; then
I=$(($I + 1))
echo "Encountered $I HELLOs"
fi
done
====================================================
#!/bin/sh
tail -f /yourlog|grep yourmsg|while read line; do
echo execute commd using $line
done
====================================================
http://sourceforge.net/projects/simple-evcorr/
http://www2.logwatch.org:81/
There are others...
====================================================
If you're thinking of perl, the File::Tail module can
help you out here.
If not, you can still do something like
tail -f <filename> | grep
"mystring" in you script, but you'll have to watch out
for logfile
rotation etc.
Regards,
John
__________________________________
Do you Yahoo!?
Yahoo! Mail - now with 250MB free storage. Learn more.
http://info.mail.yahoo.com/mail_250
_______________________________________________
sunmanagers mailing list
sunmanagers@sunmanagers.org
http://www.sunmanagers.org/mailman/listinfo/sunmanagers
This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 23:30:04 EDT