logtop(1) Realtime log line rate analyser


logtop [OPTIONS]


 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'


-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.
-h, --help
Show summary of options.
-v, --version
Show version of program.


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.


logtop was written by Julien Palard.

This manual page was written by Julien Palard <[email protected]>, for the Debian project (and may be used by others).