Logtop – Realtime log line rate analyser

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logtop is a System Administrator tool analyzing line rate on stdin.It reads on stdin and print a constantly updated result displaying.

Install logtop on ubuntu

Open the terminal and run the following command

sudo apt-get install logtop

Using Logtop

Syntax

logtop [OPTIONS]

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\t]*\n
%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.

Logtop Examples

Here are some logtop usage examples.

Realtime hit / miss ratio on some caching software log file.

tail -f cache.log | grep -o "HIT\|MISS" | logtop

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' ‘ -f1 | logtop -s 10000

Realtime most requested web pages in a NCSA like log file.

tail -f access.log | cut -d' ‘ -f7 | logtop -s 10000

Display a one-shot simple analyse of your auth.log.

cat auth.log | grep -v "CRON" | grep -o ": .*" | logtop -q -s 100000

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