我使用–as安装了两个版本的Perl(仅使用主编号命名版本)
> 5.20.0安装为5.20和
> 5.20.0,螺纹安装为5.20t
这是perlbrew列表的输出
* 5.20 (5.20.0) 5.20t (5.20.0)
然后我用Perl将Perl升级到5.20.1
$perlbrew upgrade-perl Upgrading 5.20 to 5.20.1 Installing /Users/corti/perl5/perlbrew/build/perl-5.20.1 into ~/perl5/perlbrew/perls/5.20 This could take a while. You can run the following command on another shell to track the status: tail -f ~/perl5/perlbrew/build.perl-5.20.1.log 5.20 is successfully installed.
Perl似乎正确升级(v5.20.1)：
$perl -version This is perl 5,version 20,subversion 1 (v5.20.1) built for darwin-2level Copyright 1987-2014,Larry Wall Perl may be copied only under the terms of either the Artistic License or the GNU General Public License,which may be found in the Perl 5 source kit. Complete documentation for Perl,including FAQ lists,should be found on this system using "man perl" or "perldoc perl". If you have access to the Internet,point your browser at http://www.perl.org/,the Perl Home Page.
但perlbrew列表无法识别新版本,并且调用perlbrew upgrade-perl会再次进行升级
$perlbrew list * 5.20 (5.20.0) 5.20t (5.20.0)
为什么perlbrew不承认更新？