07-12-2012
awk: Set the field separator appropriately, then, use the END pattern to print the last field of the last line using $NF.
sed: Suppress printing with -n, use $ pattern to detect when you've arrived at the final line, delete everything up to and including the last delimiter in the line, and print.
sh/tail: tail and command substitution can store that last line in a shell variable. Then parameter expansion operators can delete the unwanted content in a manner analogous (but not identical) to what you'd do with sed.
tail/cut: If you know how many fields there are in the line, you can use tail to print the final line and then cut to extract the final field.
No doubt there are other variations. What have you tried?
Regards,
Alister
Last edited by alister; 07-12-2012 at 01:31 PM..
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LEARN ABOUT DEBIAN
logtop
LOGTOP(1) General Commands Manual LOGTOP(1)
NAME
logtop - Realtime log line rate analyser
SYNOPSIS
logtop [OPTIONS]
DESCRIPTION
logtop is a System Administrator tool analyzing line rate on stdin.
It reads on stdin and print a constantly updated result
displaying, in columns:
Line number, count, frequency, and the actual line.
$ tail -f FILE | logtop
is the friendly version of:
$ watch 'tail FILE | sort | uniq -c | sort -gr'
OPTIONS
-s, --size=K
Only keep K lines in memory, instead of 10000.
-q, --quiet
Do not display a live view of the data, only display a top at exit.
-l, --line-by-line=K
Print result line by line, in a machine friendly format, K is the number of result to print per line.
Line by line format is : [%d %f %s ]*
%d : Number of occurences
%f : Frequency of apparition
%s : String (Control chars replaced by dots.
-i, --interval=K
Interval between graphical updates, in seconds. Defaults to 1.
-h, --help
Show summary of options.
-v, --version
Show version of program.
EXAMPLES
Here are some logtop usage examples.
tail -f cache.log | grep -o "HIT|MISS" | logtop
Realtime hit / miss ratio on some caching software log file.
tail -f access.log | cut -d' ' -f1 | logtop -s 10000
Realtime most querying IPs on your server, as long as log lines in access.log starts with the client IP.
tail -f access.log | cut -d' ' -f7 | logtop -s 10000
Realtime most requested web pages in a NCSA like log file.
cat auth.log | grep -v "CRON" | grep -o ": .*" | logtop -q -s 100000
Display a one-shot simple analyse of your auth.log.
SEE ALSO
watch(1)
AUTHOR
logtop was written by Julien Palard.
This manual page was written by Julien Palard <julien@palard.fr>, for the Debian project (and may be used by others).
April 16, 2011 LOGTOP(1)