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Full Discussion: Detecting new entries in log files
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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LEARN ABOUT DEBIAN

bootlogd

BOOTLOGD(8)						Linux System Administrator's Manual					       BOOTLOGD(8)

NAME

       bootlogd - record boot messages

SYNOPSIS

       /sbin/bootlogd [-c] [-d] [-r] [-s] [-v] [ -l logfile ] [ -p pidfile ]

DESCRIPTION

       Bootlogd  runs in the background and copies all strings sent to the /dev/console device to a logfile. If the logfile is not accessible, the
       messages will be kept in memory until it is.

OPTIONS

       -d     Do not fork and run in the background.

       -c     Attempt to write to the logfile even if it does not yet exist.  Without this option, bootlogd will wait for the  logfile	to  appear
	      before attempting to write to it.  This behavior prevents bootlogd from creating logfiles under mount points.

       -r     If there is an existing logfile called logfile rename it to logfile~ unless logfile~ already exists.

       -s     Ensure  that the data is written to the file after each line by calling fdatasync(3).  This will slow down a fsck(8) process running
	      in parallel.

       -v     Show version.

       -l logfile
	      Log to this logfile. The default is /var/log/boot.

       -p pidfile
	      Put process-id in this file. The default is no pidfile.

BUGS

       Bootlogd works by redirecting the console output from the console device.  (Consequently bootlogd requires PTY support in the  kernel  con-
       figuration.)   It  copies that output to the real console device and to a log file.  There is no standard way of ascertaining the real con-
       sole device if you have a new-style /dev/console device (major 5, minor 1) so bootlogd parses the kernel  command  line	looking  for  con-
       sole=... lines and deduces the real console device from that.  If that syntax is ever changed by the kernel, or a console type is used that
       bootlogd does not know about then bootlogd will not work.

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

SEE ALSO

       dmesg(8),fdatasync(3).

								   Jul 21, 2003 						       BOOTLOGD(8)
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