安装perl的版本控制器perlbrew

perlbrew可以用源码方式安装perl的各种版本，可以容纳多个perl版本共存，并随意切换。

1、把perlbrew安装到home目录：

curl -L https://install.perlbrew.pl | bash

2、编辑home目录的.bashrc文件，添加perlbrew的可执行文件，

if [ -f ~/perl5/perlbrew/etc/bashrc ]; then
     . ~/perl5/perlbrew/etc/bashrc
fi 

执行一下： source .bashrc

3、perlbrew的常用语法：

# Initialize
perlbrew init

# See what is available
perlbrew available

# Install some Perls
perlbrew install 5.18.
perlbrew install perl-5.8.
perlbrew install perl-5.19.

# See what were installed
perlbrew list

# Swith to an installation and set it as default
perlbrew switch perl-5.18.

# Temporarily use another version only in current shell.
perlbrew use perl-5.8.
perl -v

# Or turn it off completely. Useful when you messed up too deep.
# Or want to go back to the system Perl.
perlbrew off

# Use 'switch' command to turn it back on.
perlbrew switch perl-5.12.

# Exec something with all perlbrew-ed perls
perlbrew exec -- perl -E 'say $]'