Perl->重新配置CPAN
CPAN是Comprehensive Perl Archive Network的缩写.。它是一个巨大的Perl软件收藏库，收集了大量有用的Perl模块(modules)及其相关的文件。在互联网上可在此URL()找到CPAN。由于CPAN的收藏丰富，使用者甚多，在世界各地都有许多CPAN的镜站(mirror site)存在。
如果你之前配置过了CPAN，现在想修改的话，如下：
[root@localhost ~]# perl -MCPAN -e shell
Terminal does not support AddHistory.
cpan shell -- CPAN exploration and modules installation (v1.7601)
ReadLine support available (try 'install Bundle::CPAN')
cpan> o conf init
/usr/lib/perl5/5.8.5/CPAN/Config.pm initialized.
CPAN is the world-wide archive of perl resources. It consists of about
100 sites that all replicate the same contents all around the globe.
Many countries have at least one CPAN site already. The resources
found on CPAN are easily accessible with the CPAN.pm module. If you
want to use CPAN.pm, you have to configure it properly.
If you do not want to enter a dialog now, you can answer 'no' to this
question and I'll try to autoconfigure. (Note: you can revisit this
dialog anytime later by typing 'o conf init ' at the cpan prompt.)
Are you ready for manual configuration? [yes]
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