App::Timestamper - prefix lines with the timestamps of their arrivals.


version 0.2.1


    use App::Timestamper;

    App::Timestamper->new({ argv => [@ARGV] })->run();


App::Timestamper is a pure-Perl command line program that filters the input so the timestamps (in seconds+fractions since the UNIX epoch) are prefixed to the lines based on the time of the arrival.

So if the input was something like:

    First Line
    Second Line
    Third Line

It will become something like:

    1435254285.978485482\tFirst Line
    1435254302.569615087\tSecond Line
    1435254319.809459781\tThird Line

Some use cases

Some people asked me what is timestamper useful for, so I'll try to explain because I wrote the first version out of a need.

Let's suppose you have a simulation that outputs a "Reached $N iterations" line after every certain number of iterations. Like so:

    Reached 100000 iterations
    Reached 200000 iterations
    Reached 300000 iterations

You wish to draw a graph of iterations vs. time to analyse the performance of the program. So what you can do is pipe it through timestamper and then get:

    1435254285.978485482\tReached 100000 iterations
    1435254302.569615087\tReached 200000 iterations
    1435254319.809459781\tReached 300000 iterations

And after putting it in a file (using "tee" or whatever), you can filter the lines like this:

    perl -lane 'print "$1\t$2" if /\A([0-9\.]+)\tReached ([0-9]+) iterations\z/'

And get a nice tab-separated-value report of the time stamps in seconds and the iterations which you can plot using your favourite spreadsheet program or visualation framework.

Hope it helps.


Can you add an option to provide formatting options to the timestamp?

This was requested here - - and my reply was that it may be considered unnecessary feature creep, which may also hurt performance.

Nevertheless, I implemented a separate CPAN distribution and executable to do that - see App::Timestamper::Format .


I want a Pony!

Sure thing! Here you go:

    $ cat | perl -pE 's#^#Fluttershy\t#' | timestamper
    Ye scurvy dogs!
    1442662118.609309912    Fluttershy      Arrrrrr!
    1442662118.609441042    Fluttershy      Avast!
    1442662118.609464884    Fluttershy      Ye scurvy dogs!

(Fluttershy being .)

How to add a different pony is left as an exercise for the reader.



A constructor. Accepts the argv named arguments.


Runs the program.


“ts” from “moreutils”

“ts” is a program that is reportedely similar to “timestamper” and is contained in joeyh’s “moreutils” (see package. It is not easy to find online.

Chumbawamba’s song “Tubthumping”

I really like the song “Tubthumping” by Chumbawamba, which was a hit during the 1990s and whose title sounds similar to “Timestamping”, so please check it out:



The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.

Bugs / Feature Requests

Please report any bugs or feature requests by email to bug-app-timestamper at, or through the web interface at You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

  git clone git://


Shlomi Fish <>


Please report any bugs or feature requests on the bugtracker website

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.


This software is Copyright (c) 2015 by Shlomi Fish.

This is free software, licensed under:

  The MIT (X11) License