05-07-2013
1) lots, but large dirs are slow to process, so nobody goes there. Think of a path name for a complex object, now in place of 30k of them in one dir, look for separations and put slashes in there, and voila, smaller directories.
2) limited only by path length. Welcome to recursion. Lots of JAVA guys go nuts under windows' 255 char limit. UNIX is usually 1024 but I believe you can compile a more generous number into your kernel.
Each directory is an inode, just like a file but marked for directory handling. Think of it as a big dumb list of entry name and inode #, nothing else. Things like pipes and devices are a lot more 'special'.
Lots of O/S have just directory and flat file. Soft and hard links are not always there. Devices live somewhere outside the file tree, and if you want pipe behavior, you have to program.
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