Realtime lines per second in a log file, with history
[2.00 s] [2.00 s] [4.20 s] [20.4 s] [8.20 s] [11.6 s] [2.02 s] [13.9 s] [7.19 s] [5.00 s] [2.00 s] [16.4 s] [10.8 s]
7 Alternatives + Submit Alt
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Displays the realtime line output rate of a logfile. -l tels pv to count lines -i to refresh every 10 seconds -l option is not in old versions of pv. If the remote system has an old pv version: ssh tail -f /var/log/apache2/access.log | pv -l -i10 -r >/dev/null
10tail -f access.log | pv -l -i10 -r >/dev/null -
The cut should match the relevant timestamp part of the logfile, the uniq will count the number of occurrences during this time interval. Show Sample Output
5grep <something> logfile | cut -c2-18 | uniq -c -
Using tail to follow and standard perl to count and print the lps when lines are written to the logfile.
5tail -f /var/log/logfile|perl -e 'while (<>) {$l++;if (time > $e) {$e=time;print "$l\n";$l=0}}' -
2tail -F some.log | perl -ne 'print time(), "\n";' | uniq -c
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Another way of counting the line output of tail over 10s not requiring pv. Cut to have the average per second rate : tail -n0 -f access.log>/tmp/tmp.log & sleep 10; kill $! ; wc -l /tmp/tmp.log | cut -c-2 You can also enclose it in a loop and send stderr to /dev/null : while true; do tail -n0 -f access.log>/tmp/tmp.log & sleep 2; kill $! ; wc -l /tmp/tmp.log | cut -c-2; done 2>/dev/null
1tail -n0 -f access.log>/tmp/tmp.log & sleep 10; kill $! ; wc -l /tmp/tmp.log
What do you think?
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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