NAME

V - Print version of the specified module(s).

SYNOPSIS

    $ perl -MV=V

or if you want more than one

    $ perl -MV=CPAN,V

Can now also be used as a light-weight module for getting versions of modules without loading them:

    require V;
    printf "%s has version '%s'\n", "V", V::get_version( "V" );

Starting with version 0.17, V will show all packages or classes in a file that have a version. If one wants to see all packages/classes from that file, set the environment variable PERL_V_SHOW_ALL to a true value.

If you want all available files/versions from @INC:

    require V;
    my @all_V = V::Module::Info->all_installed("V");
    printf "%s:\n", $all_V[0]->name;
    for my $file (@all_V) {
        my ($versions) = $file->version; # Must be list context
        if (@$versions > 1) {
            printf "\t%s:\n", $file->name;
            for my $ver (@versions) {
                print "\t    %-30s: %s\n", $ver->{pkg}, $ver->{version};
            }
        }
        else {
            printf "\t%-50s - %s\n", $file->file, $versions->[0]{version};
        }
    }

Each element in that array isa V::Module::Info object with 3 attributes and a method:

attribute name

The package name.

attribute file

Full filename with directory.

attribute dir

The base directory (from @INC) where the package-file was found.

method version

This method will look through the file to see if it can find a version assignment in the file and uses that to determine the version. As of version 0.13_01, all versions found are passed through the version module.

As of version 0.16_03 we look for all types of version declaration:

    package Foo;
    our $VERSION = 0.42;

and

    package Foo 0.42;

and

    package Foo 0.42 { ... }

Not only do we look for the package keyword, but also for class. In list context this method will return an arrayref to a list of structures:

pkg

The name of the package/class.

version

The version for that package/class. (Can be absent if $PERL_V_SHOW_ALL is true.)

ord

The ordinal number of occurrence in the file.

DESCRIPTION

This module uses stolen code from Module::Info to find the location and version of the specified module(s). It prints them and exit()s.

It defines import() and is based on an idea from Michael Schwern on the perl5-porters list. See the discussion:

  https://www.nntp.perl.org/group/perl.perl5.porters/2002/01/msg51007.html

V::get_version($pkg)

Returns the version of the first available file for this package as found by following @INC.

Arguments

1. $pkg

The name of the package for which one wants to know the version.

Response

This V::get_version() returns the version of the file that was first found for this package by following @INC or undef if no file was found.

AUTHOR

Abe Timmerman <abeltje@cpan.org>.

COPYRIGHT & LICENSE

Copyright 2002-2006 Abe Timmerman, All Rights Reserved.

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

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.