Twin directories of Unix:

[DIR]  ftp://ftp.kddlabs.co.jp/21/lang/perl/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp5.freebsd.org/pub/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp5.freebsd.org/pub/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.thquast.de/mirror/ftp.funet.fi/pub/languages/perl/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.thquast.de/mirror/ftp.funet.fi/pub/languages/perl/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.ruhr-uni-bochum.de/.subdisc1/mirrors/ftp.funet.fi/pub/languages/perl/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.ruhr-uni-bochum.de/.subdisc1/mirrors/ftp.funet.fi/pub/languages/perl/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.sg.freebsd.org/d/a/cpan.org/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.sg.freebsd.org/d/a/cpan.org/modules/by-module/Unix/
[DIR]  ftp://ftp.pop-mg.com.br/data/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.pop-mg.com.br/data/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.in2p3.fr/pub/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.uoregon.edu/pub/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.in2p3.fr/pub/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.uoregon.edu/pub/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.ucr.ac.cr/pub/Unix/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.linux.pt/pub/mirrors/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.linuxforum.net/pub/www/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.saix.net/pub2/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.cgu.edu.tw/pub3/Mirror/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.cgu.edu.tw/pub3/Mirror/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.onenet.net/mirrors/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.carnet.hr/misc/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.carnet.hr/misc/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.dei.uc.pt/pub/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.dei.uc.pt/pub/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.ucsd.edu/mirror/perl/CPAN/ftp.funet.fi/pub/languages/perl/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.ucsd.edu/mirror/perl/CPAN/ftp.funet.fi/pub/languages/perl/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.funet.fi/pub/languages/perl/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.funet.fi/pub/languages/perl/CPAN/modules/by-module/Unix/
[DIR]  ftp://64.50.236.52/.1/cpan/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://64.50.238.52/.1/cpan/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://64.50.236.52/.1/cpan/modules/by-module/Unix/
[DIR]  ftp://64.50.238.52/.1/cpan/modules/by-module/Unix/
[DIR]  ftp://193.226.140.51/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://193.226.140.51/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.mgts.by/pub/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.mgts.by/pub/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.nfsi.pt/pub/cpan/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.nfsi.pt/pub/cpan/modules/by-module/Unix/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/CPAN/modules/by-module/Unix/
[DIR]  ftp://gcc.gnu.org/pub/xconq/xconq-7.5.pre/Unix/
[DIR]  ftp://ftp.kc.ru/pub/Doc/BOOK/UNIX/Unix/
[DIR]  ftp://ftp.ntut.edu.tw/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.ntut.edu.tw/CPAN/modules/by-module/Unix/
[DIR]  ftp://ftp.linux.ee/mount/tux/gnu/gnu/sourceware/xconq/xconq-7.5.pre/Unix/
[DIR]  ftp://zoffy.asahi-net.or.jp/pub/lang/perl/CPAN/modules/by-module/Unix/
[DIR]  ftp://zoffy.asahi-net.or.jp/pub/lang/perl/CPAN/modules/by-category/04_Operating_System_Interfaces/Unix/
[DIR]  ftp://ftp.loxinfo.co.th/pub/cpan/modules/by-category/04_Operating_System_Interfaces/Unix/