修改CPAN配置文件
root用户路径：/root/.cpan/CPAN/MyConfig.pm
一般用户（本例为abc）路径：/home/abc/.cpan/CPAN/MyConfig.pm
查看配置的指令：
第一步，输入cpan
第二步，看到cpan>提示符，输入o conf
修改2处配置如下：
1） 'http_proxy' => q[http://192.168.1.2:8080], 此处与浏览器代理配置相同
2） 'urllist' => [q[http://www.cpan.org/]], 此处配置能访问到的网址
自动安装举例：cpan Spreadsheet::ParseExcel
自动安装的好处是能自动识别依赖关系，对于依赖关系很深的情形，能够显著节约时间，确保安装成功。
MyConfig.pm文件内容如下：
[root@localhost CPAN]# cat /root/.cpan/CPAN/MyConfig.pm
$CPAN::Config = {
'applypatch' => q[],
'auto_commit' => q[0],
'build_cache' => q[100],
'build_dir' => q[/root/.cpan/build],
'build_dir_reuse' => q[0],
'build_requires_install_policy' => q[yes],
'bzip2' => q[/usr/bin/bzip2],
'cache_metadata' => q[1],
'check_sigs' => q[0],
'colorize_output' => q[0],
'commandnumber_in_prompt' => q[1],
'connect_to_internet_ok' => q[1],
'cpan_home' => q[/root/.cpan],
'ftp_passive' => q[1],
'ftp_proxy' => q[],
'getcwd' => q[cwd],
'gpg' => q[/usr/bin/gpg],
'gzip' => q[/bin/gzip],
'halt_on_failure' => q[0],
'histfile' => q[/root/.cpan/histfile],
'histsize' => q[100],
'http_proxy' => q[http://192.168.1.2:8080],
'inactivity_timeout' => q[0],
'index_expire' => q[1],
'inhibit_startup_message' => q[0],
'keep_source_where' => q[/root/.cpan/sources],
'load_module_verbosity' => q[none],
'make' => q[/usr/bin/make],
'make_arg' => q[],
'make_install_arg' => q[],
'make_install_make_command' => q[/usr/bin/make],
'makepl_arg' => q[],
'mbuild_arg' => q[],
'mbuild_install_arg' => q[],
'mbuild_install_build_command' => q[./Build],
'mbuildpl_arg' => q[],
'no_proxy' => q[],
'pager' => q[/usr/bin/less],
'patch' => q[/usr/bin/patch],
'perl5lib_verbosity' => q[none],
'prefer_external_tar' => q[1],
'prefer_installer' => q[MB],
'prefs_dir' => q[/root/.cpan/prefs],
'prerequisites_policy' => q[follow],
'scan_cache' => q[atstart],
'shell' => q[/bin/bash],
'show_unparsable_versions' => q[0],
'show_upload_date' => q[0],
'show_zero_versions' => q[0],
'tar' => q[/bin/tar],
'tar_verbosity' => q[none],
'term_is_latin' => q[1],
'term_ornaments' => q[1],
'test_report' => q[0],
'trust_test_report_history' => q[0],
'unzip' => q[/usr/bin/unzip],
'urllist' => [q[http://www.cpan.org/]],
'use_sqlite' => q[0],
'version_timeout' => q[15],
'wget' => q[/usr/bin/wget],
'yaml_load_code' => q[0],
'yaml_module' => q[YAML],
};
1;
__END__
查看perl模块信息（按ESC后，输入:q退出）：
perldoc perllocal