用CPAN安装Perl模块时出现Can't locate CPAN.pm in @INC错误的解决方法，遇到类似问题的朋友可以参考下。
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。
这里主要是使用Perl-Net-SNMP模块。
问题描述：
[root@CactiEZ download]# perl -MCPAN -e shell
Can't locate CPAN.pm in @INC (@INC contains: /usr/local/lib/perl5 /usr/local/share/perl5 /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5 /usr/share/perl5 .).
安装perl模块的步骤如下：
1. Check whether you have 'perl-CPAN‘ package installed in your system.
For checking ‘perl-CPAN’ package run following in your shell.
[root@host13 ~]# rpm -q perl-CPAN
If perl-CPAN package is installed, you will get the output like this
perl-CPAN-1.9402-116.fc13.i686
else, you will get output like this
package perl-CPAN is not installed
and that the case you need to install it. You can install it via using yum, yum install perl-CPAN or from rpm, from “rpm.pbone.net” you can obtain “perl-CPAN rpm’s”.
2. Running the command "perl -MCPAN -e shell" will brought you to a CPAN command prompt
[root@host13 ~]# perl -MCPAN -e shell
Terminal does not support AddHistory.
cpan shell -- CPAN exploration and modules installation (v1.9402)
Enter 'h' for help.
cpan[1]>
Note : If this is the first time you’ve run CPAN, it’s going to ask you a series of questions – in most cases the default answer is fine.
If you got an error given below, then you need to confirm the "perl-CPAN" package’s existence in the sytem
Can't locate CPAN.pm in @INC (@INC contains: /usr/local/lib/perl5 /usr/local/share/perl5
/usr/local/share/perl5 /usr/lib/perl5 /usr/share/perl5
/usr/share/perl5 /usr/lib/perl5 /usr/share/perl5 /usr/local/lib/perl5/site_perl/5.10.0/i386-linux-thread-multi /usr/local/lib/perl5/site_perl/5.10.0 /usr/lib/perl5/vendor_perl/5.10.0/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.10.0 /usr/lib/perl5/vendor_perl /usr/lib/perl5/site_perl .).
BEGIN failed--compilation aborted.
3. From this command prompt you can install the perl modules.
Examples:
cpan[1]> install MIME::Entity
cpan[1]> install MIME::Parser
cpan[1]> install Crypt::PasswdMD5
cpan[1]> install Term::ReadPassword
cpan[1]> install Crypt::CBC
cpan[1]> install Crypt::Blowfish
cpan[1]> install Daemon::Generic
cpan[1]> install DateTime
cpan[1]> install SOAP::Lite
Alternative for second and third step.
[root@host13 ~]# perl -MCPAN -e 'install HTML::Template'
[root@host13 ~]# perl -MCPAN -e 'install MIME::Entity'
[root@host13 ~]# perl -MCPAN -e 'install Crypt::PasswdMD5'
[root@host13 ~]# perl -MCPAN -e 'install Term::ReadPassword'
[root@host13 ~]# perl -MCPAN -e 'install Crypt::CBC'
[root@host13 ~]# perl -MCPAN -e 'install Crypt::Blowfish'
[root@host13 ~]# perl -MCPAN -e 'install Daemon::Generic'
[root@host13 ~]# perl -MCPAN -e 'install DateTime'
[root@host13 ~]# perl -MCPAN -e 'install SOAP::Lite'