setenv PERL /opt/perl5 --设置新perl的起始安装路径
curl -kL http://install.perlbrew.pl | bash
source /opt/perl5/perlbrew/etc/bashrc
perlbrew init
perlbrew root (/opt/perl5/perlbrew) is initialized.
Append the following piece of code to the end of your ~/.bash_profile and start a
new shell, perlbrew should be up and fully functional from there:
source ~/perl5/perlbrew/etc/bashrc
Simply run `perlbrew` for usage details.
Happy brewing!
perlbrew install perl-5.16.0
perlbrew switch perl-5.16.0
至此，当前perl已经切换到新安装的perl-5.16.0
如果想再切换回旧版的，
source /opt/perl5/perlbrew/etc/bashrc
perlbrew switch-off
perl -v 查看当前版本已经切回。
完毕！
原文：http://www.cnblogs.com/gordonchang/p/6681557.html