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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
Using tail to follow and standard perl to count and print the lps when lines are written to the logfile.
The cut should match the relevant timestamp part of the logfile, the uniq will count the number of occurrences during this time interval.
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
Realtime lines per second in a log file using python ... identical to perl version, except python is much better :)
If you can do better, submit your command here.
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