1App::Cmd::Command::helpU(s3e)r Contributed Perl DocumentaAtpipo:n:Cmd::Command::help(3)
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NAME

6       App::Cmd::Command::help - display a command's help screen
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VERSION

9       version 0.331
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DESCRIPTION

12       This command will either list all of the application commands and their
13       abstracts, or display the usage screen for a subcommand with its
14       description.
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USAGE

17       The help text is generated from three sources:
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19       ·   The "usage_desc" method
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21       ·   The "description" method
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23       ·   The "opt_spec" data structure
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25       The "usage_desc" method provides the opening usage line, following the
26       specification described in Getopt::Long::Descriptive.  In some cases,
27       the default "usage_desc" in App::Cmd::Command may be sufficient and you
28       will only need to override it to provide additional command line usage
29       information.
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31       The "opt_spec" data structure is used with Getopt::Long::Descriptive to
32       generate the description of the options.
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34       Subcommand classes should override the "discription" method to provide
35       additional information that is prepended before the option
36       descriptions.
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38       For example, consider the following subcommand module:
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40         package YourApp::Command::initialize;
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42         # This is the default from App::Cmd::Command
43         sub usage_desc {
44           my ($self) = @_;
45           my $desc = $self->SUPER::usage_desc; # "%c COMMAND %o"
46           return "$desc [DIRECTORY]";
47         }
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49         sub description {
50           return "The initialize command prepares the application...";
51         }
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53         sub opt_spec {
54           return (
55             [ "skip-refs|R",  "skip reference checks during init", ],
56             [ "values|v=s@",  "starting values", { default => [ 0, 1, 3 ] } ],
57           );
58         }
59
60         ...
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62       That module would generate help output like this:
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64         $ yourapp help initialize
65         yourapp initialize [-Rv] [long options...] [DIRECTORY]
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67         The initialize command prepares the application...
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69               --help            This usage screen
70               -R --skip-refs    skip reference checks during init
71               -v --values       starting values
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AUTHOR

74       Ricardo Signes <rjbs@cpan.org>
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77       This software is copyright (c) 2016 by Ricardo Signes.
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79       This is free software; you can redistribute it and/or modify it under
80       the same terms as the Perl 5 programming language system itself.
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84perl v5.30.1                      2020-01-29        App::Cmd::Command::help(3)
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