Realtime lines per second in a log file

tail -f access.log | pv -l -i10 -r >/dev/null

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

By: dooblem

2010-04-29 21:02:01

tail tail pv

7 Alternatives + Submit Alt

Count occurrences per minute in a log file

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
This is sample output - yours may be different.
```
      1 29/Apr/2010:13:06
      1 29/Apr/2010:13:05
   1496 29/Apr/2010:13:06
   1635 29/Apr/2010:13:07
   1414 29/Apr/2010:13:08
   1329 29/Apr/2010:13:09
      1 29/Apr/2010:13:10
```
5

grep <something> logfile | cut -c2-18 | uniq -c

buzzy · 2010-04-29 11:26:09 6
Realtime lines per second in a log file

Using tail to follow and standard perl to count and print the lps when lines are written to the logfile.
This is sample output - yours may be different.
5

tail -f /var/log/logfile|perl -e 'while (<>) {$l++;if (time > $e) {$e=time;print "$l\n";$l=0}}'

madsen · 2011-06-21 10:28:26 8
Lines per second in a log file
This is sample output - yours may be different.
2

tail -F some.log | perl -ne 'print time(), "\n";' | uniq -c

grana · 2013-05-11 04:51:22 7
Lines per second in a log file

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
This is sample output - yours may be different.
1

tail -n0 -f access.log>/tmp/tmp.log & sleep 10; kill $! ; wc -l /tmp/tmp.log

dooblem · 2010-04-29 21:23:46 17
Realtime lines per second in a log file, with history

This is similar to standard `pv`, but it retains the rate history instead of only showing the current rate. This is useful for spotting changes. To do this, -f is used to force pv to output, and stderr is redirected to stdout so that `tr` can swap the carriage returns for new lines. (doesn't work correctly is in zsh for some reason. Tail's output isn't redirected to /dev/null like it is in bash. anyone know why? ???????) Show Sample Output
This is sample output - yours may be different.
```
[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]
```
1

tail -f access.log | pv -l -i10 -r -f 2>&1 >/dev/null | tr /\\r \ \\n

varenc · 2020-04-19 02:07:40 97

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yeneba6574 · 18 weeks and 2 days ago

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