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ubuntu 非常简单的方式安装多个perl版本
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参考http://stackoverflow.com/questions/22934080/how-to-downgrade-to-perl-5-10-1
Perlbrew will allow you to install multiple versions of Perl as user installed Perls.
安装perlbrew
apt-get install perlbrew
To install a particular version of Perl:
perlbrew install 5.10 # I'm installing Perl 5.10!
安装perl前需要建立文件夹:~/perl5/perlbrew/dists和:~/perl5/perlbrew/bulid
To switch from one version of Perl to another:
perlbrew use 5.10 # Use this version in the current shell
or
perlbrew switch 5.10 # This is now your default version of Perl
