... Structure¹

This is a translated and slightly revised version of the paper presented at the III International Forum on Free Software, Porto Alegre, Brazil, 2002.

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.../usr/local/sbin²

files from the X Window System are, historically, an exception to this rule, possessing an entire UNIX-like hierarchy under /usr/X11R6

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... tree³

The AtheOS operating system uses a similar technique to maintain compatibility with UNIX applications

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