perl:can'；找不到模块，但它在@INC路径中？

在本例中，我尝试访问IPC:：Open3：

bash-4.2# perl RunScript hier_clustering1.py
Can't locate IPC/open3.pm in @INC (you may need to install the IPC::open3 module) (@INC contains: /root/perl5/perlbrew/perls/perl-5.20.0/lib/site_perl/5.20.0/x86_64-linux /root/perl5/perlbrew/perls/perl-5.20.0/lib/site_perl/5.20.0 /root/perl5/perlbrew/perls/perl-5.20.0/lib/5.20.0/x86_64-linux /root/perl5/perlbrew/perls/perl-5.20.0/lib/5.20.0 .) at RunScript line 4.
BEGIN failed--compilation aborted at RunScript line 4.
bash-4.2# cd /root/perl5/perlbrew/perls/perl-5.20.0/lib/5.20.0
bash-4.2# cd IPC
bash-4.2# ls
Cmd.pm  Open2.pm  Open3.pm

如您所见，IPC:：Open3已清楚地安装在path中

这是在运行perlbrew安装的perl的perlbrew shell中：

bash-4.2# which perl
/root/perl5/perlbrew/perls/perl-5.20.0/bin/perl

---

这是怎么回事？

检查你的大写字母

open3

和

open3

是不同的