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Tom Christiansen's script to detect version of perl modules

#!/usr/bin/env perl
# pmvers -- print out a module's version, if findable
# tchrist@perl.com

BEGIN { $^W = 1 }

$errors = 0;

for $module (@ARGV) {
    eval "local \$^W = 0; require $module";
    if ($@) {
	$@ =~ s/at \(eval.*$//;
	warn "$0: $@";
	$errors++;
	next;
    } 
    print "$module: " if @ARGV > 1;
    if (defined($version = $module->VERSION())) { 
	print "$version\n";
    } 
    else { 
	$errors++;
	if (@ARGV > 1) {
	    print "unknown version\n";
	} 
	else {
	    warn "$0: unknown version for module `$module'\n";
	} 
    }
} 

exit ($errors != 0);


__END__

=head1 NAME

pmvers - print out a module's version

=head1 DESCRIPTION

Given one or more module names, show the version number if present.
If more than one argument is given, the name of the module will also
be printed.  Not all modules define version numbers, however.

=head1 EXAMPLES

    $ pmvers CGI
    2.46

    $ pmvers IO::Socket Text::Parsewords
    IO::Socket: 1.25
    Text::ParseWords: 3.1

    $ oldperl -S pmvers CGI
    2.42

    $ filsperl -S pmvers CGI
    2.46

    $ pmvers Devel::Loaded
    pmvers: unknown version for module `Devel::Loaded'

h=ead1 SEE ALSO

pmdesc(1),
pmpath(1),
pmcat(1).

=head1 AUTHOR and COPYRIGHT

Copyright (c) 1999 Tom Christiansen

This is free software.  You may modify it and distribute it 
under Perl's Artistic Licence.  Modified versions must be
clearly indicated.