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File::ShouldUpdate - should files be rebuilt?


version 0.2.1


    use File::ShouldUpdate qw/ should_update should_update_multi /;

    if (should_update("output.html", ":", "in.tt2", "data.sqlite"))

    if (should_update_multi(["output.html", "about.html", "contact.html"], ":", ["in.tt2", "data.sqlite"]))


This module provides should_update() and should_update_multi() which can be used to determine if files should be updated based on the mtime timestamps of their dependencies. They avoid confusing between targets and dependencies by using the syntactic sugar of the familiar makefile rules ( ).


my $verdict = should_update($target, ":", @deps);

Should $target be updated if it doesn't exist or older than any of the deps.

my $verdict = should_update_multi([@targets], ":", [@deps]);

Should @targets be updated if some of them do not exist or any of them are older than any of the deps.

Note that you must pass array references.

[Added in version 0.2.0.]



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-file-shouldupdate 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) 2020 by Shlomi Fish.

This is free software, licensed under:

  The MIT (X11) License