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Full Discussion: to find difference between two files
Homework and Emergencies Emergency UNIX and Linux Support to find difference between two files Post 302357615 by bakunin on Wednesday 30th of September 2009 08:58:05 AM
Old 09-30-2009
If you know the number of records (you said they vary, but maybe the number is known somehow), then simply "tail" the last <n> records, where <n> is the number of records (i suppose records to be lines):

Code:
tail -<n> /path/to/newfile

If the records are multilined but with a fixed number of <x> lines for each record:

Code:
tail -$((<x>*<n>)) /path/to/newfile

If the records for the present day are not all stored already you still might still know the number of records from the beginning which you have to filter out, leaving the non-filtered records as new. Example: 3 records per day, today is the 10th day of the month. You will have to filter the first 9 days (meaning 9*3=27 lines) and everything left will be from today.

Code:
sed '1,'"$((<number_of_the_day-1>*<x>))"'d' /path/to/newfile

I hope this helps.

bakunin
Last edited by bakunin; 09-30-2009 at 10:13 AM..
 

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LEARN ABOUT CENTOS

ragator

RAGATOR(1)						      General Commands Manual							RAGATOR(1)

NAME

       ragator - aggregate argus(8) data file entries.

COPYRIGHT

       Copyright (c) 2000-2003 QoSient. All rights reserved.

SYNOPSIS

       ragator [-f ragator.conf] [raoptions]

DESCRIPTION

       Ragator	reads argus(8) data from an argus-file, and merges matching argus flow activity records together.  In its default mode of options,
       this effectively converts argus(8) files from detail to non-detail mode, and merges periodic flow report records to a single argus  record,
       thus compressing the argus(8) file to a reduced size.

       You can modify the aggregation strategy used by ragator to merge records together, by using the -f ragator.conf option.	See ragator(5) for
       a complete description of the format and syntax of the flow model file.

OPTIONS

       Ragator, like all ra based clients, supports a number of ra options including filtering of input argus records through a terminating filter
       expression.  See ra(1) for a complete description of ra options.

AUTHORS

       Carter Bullard (carter@qosient.com).

SEE ALSO

       ragator(5) ra(1), rarc(5), argus(8) tcpdump(1),

								   21 July 1995 							RAGATOR(1)
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