例子 ：

• 模块的当前版本：

$pm-uninstall -V
App::pmuninstall v0.15

• 再次安装模块：

$cpanm pm-uninstall
! Finding pm-uninstall on cpanmetadb failed.
--> Working on pm-uninstall
Fetching http://search.cpan.org/CPAN/authors/id/X/XA/XAICRON/App-pmuninstall-0.16.tar.gz ... OK
Configuring App-pmuninstall-0.16 ... OK
Building and testing App-pmuninstall-0.16 ... OK
Successfully installed App-pmuninstall-0.16

• 并且模块升级：

$pm-uninstall -V
App::pmuninstall v0.16

如果需要升级很多模块，
可以使用 App::cpanoutdated

安装 App::cpanoutdated

cpanm -v App::cpanoutdated

如何使用App::cpanoutdated

查看 App::cpanoutdated 的帮助

$cpan-outdated --help
Usage:
        # print the list of distribution that contains outdated modules
        % cpan-outdated
        # print the list of outdated modules in packages
        % cpan-outdated -p
        # verbose
        % cpan-outdated --verbose
        # alternate mirrors
        % cpan-outdated --mirror file:///home/user/minicpan/
        # additional module path(same as cpanminus)
        % cpan-outdated -l extlib/
        % cpan-outdated -L extlib/
        # install with cpan
        % cpan-outdated | xargs cpan -i
        # install with cpanm
        % cpan-outdated    | cpanm
        % cpan-outdated -p | cpanm

升级一个或者几个 perl 模块