The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.


Getopt::Long::Dump - Run a Getopt::Long-based script but only to dump the spec


This document describes version 0.112 of Getopt::Long::Dump (from Perl distribution Getopt-Long-Dump), released on 2022-08-10.




 dump_getopt_long_script(%args) -> [$status_code, $reason, $payload, \%result_meta]

Run a Getopt::Long-based script but only to dump the spec.

This function runs a CLI script that uses Getopt::Long but monkey-patches beforehand so that run() will dump the object and then exit. The goal is to get the object without actually running the script.

This can be used to gather information about the script and then generate documentation about it or do other things (e.g. App::shcompgen to generate a completion script for the original script).

CLI script needs to use Getopt::Long. This is detected currently by a simple regex. If script is not detected as using Getopt::Long, status 412 is returned.

Will return the Getopt::Long specification.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • filename* => str

    Path to the script.

  • libs => array[str]

    Libraries to unshift to @INC when running script.

  • skip_detect => bool

Returns an enveloped result (an array).

First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.

Return value: (any)



Will be set to 1 when executing the script to be dumped.


Please visit the project's homepage at


Source repository is at


perlancar <>


To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.


This software is copyright (c) 2022, 2016, 2015, 2014 by perlancar <>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.


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.