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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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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c nbytes ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or bytes, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and bytes from 0. Tail is ignorant of UTF. TAIL(1)
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