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Top Forums Shell Programming and Scripting Detecting new entries in log files Post 302841219 by rbatte1 on Wednesday 7th of August 2013 06:02:27 AM
Old 08-07-2013
You could read the log in real time with tail -f if that helps. Beyond this, you may need to keep and old version and compare them. Using diff can be awkward because it adds editing messages if you are to shovel the output into ed so perhaps you would be better to count the lines in your saved version and then get extra lines from the current file, something like:-
Code:
cp logfile temp_logfile
old_lines=`grep -c "" old_logfile`
temp_lines=`grep -c "" temp_logfile`
((lines=$new_lines-$old_lines))
tail -n $lines temp_logfile
.... some other processing if you like.....
mv temp_logfile old_logfile

I've added the temporary log file so that messages can still be added to the main logfile as you are working on it without it skewing the output, so it givers you a fixed reference point.




i hope that this might help.



Robin
Liverpool/Blackburn
UK
This User Gave Thanks to rbatte1 For This Post:
 

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LOGWATCH(8)							   User Manuals 						       LOGWATCH(8)

NAME
logwatch - system log analyzer and reporter SYNOPSIS
logwatch [--detail level ] [--logfile log-file-group ] [--service service-name ] [--print] [--mailto address ] [--archives] [--range range ] [--debug level ] [--save file-name ] [--logdir directory ] [--hostname hostname ] [--help|--usage] DESCRIPTION
LogWatch is a customizable, pluggable log-monitoring system. It will go through your logs for a given period of time and make a report in the areas that you wish with the detail that you wish. Easy to use - works right out of the package on almost all systems. OPTIONS
--detail level This is the detail level of the report. level can be high, med, low. --logfile log-file-group This will force LogWatch to process only the set of logfiles defined by log-file-group (i.e. messages, xferlog, ...). LogWatch will therefore process all services that use those logfiles. This option can be specified more than once to specify multiple logfile- groups. --service service-name This will force LogWatch to process only the service specified in service-name (i.e. login, pam, identd, ...). LogWatch will there- fore also process any log-file-groups necessary to process these services. This option can be specified more than once to specify multiple services to process. A useful service-name is All which will process all services (and logfile-groups) for which you have filters installed. --print Print the results to stdout (i.e. the screen). --mailto address Mail the results to the email address or user specified in address. --archives Each log-file-group has basic logfiles (i.e. /var/log/messages) as well as archives (i.e. /var/log/messages.? or /var/log/mes- sages.?.gz). This option will make LogWatch search through the archives in addition to the regular logfiles. The entries must still be in the proper date range (see below) to be processed, however. --range range You can specify a date-range to process. This option is currently limited to only Yesterday, Today and All. --debug level For debugging purposes. level can range from 0 to 100. This will really clutter up your output. You probably don't want to use this. --save file-name Save the output to file-name instead of displaying or mailing it. --logdir directory Look in directory for log files instead of the default directory. --hostname hostname Use hostname for the reports instead of this system's hostname. In addition, if HostLimit is set in /etc/log.d/logwatch.conf, then only logs from this hostname will be processed (where appropriate). --usage Displays usage information --help same as --usage. FILES
/etc/log.d/logwatch.conf Really a symlink to /etc/log.d/conf/logwatch.conf. This file sets the default values of all the above options. These defaults are used when LogWatch is called without any parameters (i.e. from cron.daily). The file is well-documented, but the explanations above also apply to this config file. /etc/log.d/conf/services/* Configuration files for the various services whose log entries LogWatch can process. /etc/log.d/conf/logfiles/* Configuration files for the various logfiles that the above service's log entries are stored in. /etc/log.d/scripts/shared/* Filters common to many services and/or logfiles. /etc/log.d/scripts/logfiles/* Filters specific to just particular logfiles. /etc/log.d/scripts/services/* Actual filter programs for the various services. EXAMPLES
logwatch --service ftpd-xferlog --range all --detail high --print --archives This will print out all FTP transfers that are stored in all current and archived xferlogs. logwatch --service pam_pwdb --range yesterday --detail high --print This will print out login information for the previous day... MORE INFORMATION
For information on adding your own filter, please see the file HOWTO-Make-Filter which should have been included with Logwatch. If you installed from an RPM, it is probably under /usr/share/doc/logwatch-XXX. BUGS
The --range option is very weak... this will be fixed in the future. AUTHOR
Kirk Bauer <kirk@kaybee.org> http://www.kaybee.org/~kirk ftp://ftp.kaybee.org/pub/redhat/RPMS Linux MARCH 1998 LOGWATCH(8)
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