$CPAN::Config options from /usr/share/perl5/CPAN/Config.pm:
    commit             [Commit changes to disk]
    defaults           [Reload defaults from disk]
    help               [Short help about 'o conf' usage]
    init               [Interactive setting of all options]

    applypatch         []
    auto_commit        [0]
    build_cache        [100]
    build_dir          [/root/.cpan/build]
    build_dir_reuse    [0]
    build_requires_install_policy [ask/yes]
    bzip2              [/usr/bin/bzip2]
    cache_metadata     [1]
    check_sigs         [0]
    colorize_debug     undef
    colorize_output    undef
    colorize_print     undef
    colorize_warn      undef
    commandnumber_in_prompt [1]
    commands_quote     undef
    connect_to_internet_ok [1]
    cpan_home          [/root/.cpan]
    curl               [/usr/bin/curl]
    dontload_hash      undef
    dontload_list      undef
    ftp                []
    ftp_passive        [1]
    ftp_proxy          []
    ftpstats_period    undef
    ftpstats_size      undef
    getcwd             [cwd]
    gpg                [/usr/bin/gpg]
    gzip               [/bin/gzip]
    halt_on_failure    [0]
    histfile           [/root/.cpan/histfile]
    histsize           [100]
    http_proxy         []
    inactivity_timeout [0]
    index_expire       [1]
    inhibit_startup_message [0]
    keep_source_where  [/root/.cpan/sources]
    load_module_verbosity [v]
    lynx               []
    make               [/usr/bin/make]
    make_arg           []
    make_install_arg   []
    make_install_make_command [/usr/bin/make]
    makepl_arg         [EXPATLIBPATH=//data/shared/expat-2.1.0/lib EXPATINCPATH=//data/shared/expat-2.1.0/include]
    mbuild_arg         []
    mbuild_install_arg []
    mbuild_install_build_command [./Build]
    mbuildpl_arg       [--installdirs site]
    ncftp              []
    ncftpget           []
    no_proxy           []
    pager              [/usr/bin/less]
    password           undef
    patch              [/usr/bin/patch]
    patches_dir        undef
    perl5lib_verbosity [v]
    prefer_external_tar undef
    prefer_installer   [MB]
    prefs_dir          [/root/.cpan/prefs]
    prerequisites_policy [ask]
    proxy_pass         undef
    proxy_user         undef
    randomize_urllist  undef
    scan_cache         [atstart]
    shell              [/bin/bash]
    show_unparsable_versions [0]
    show_upload_date   [0]
    show_zero_versions [0]
    tar                [/bin/tar]
    tar_verbosity      [v]
    term_is_latin      [1]
    term_ornaments     [1]
    test_report        [0]
    trust_test_report_history [0]
    unzip              [/usr/bin/unzip]
    urllist
    use_sqlite         [0]
    username           undef
    version_timeout    undef
    wait_list          undef
    wget               [/usr/bin/wget]
    yaml_load_code     [0]
    yaml_module        [YAML]