ftp://ftp.song.fi/pub/mirrors/cpan/modules/by-category/10_File_Names_Systems_Locking/  direct

[DIR]Stat/  direct  639+ twin directories
[DIR]LockFile/  direct  404+ twin directories
[DIR]Filesys/  direct  681+ twin directories
[DIR]File/  direct  7372+ twin directories
[DIR]Directory/  direct  486+ twin directories
[DIR]Dir/  direct  603+ twin directories
[DIR]Cwd/  direct  634+ twin directories
[DIR]AFS/  direct  383+ twin directories