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+U9fs is a program that serves Unix files to Plan 9 machines using the
+9P protocol. It is typically invoked on a Unix machine by inetd with
+its standard input and output connected to a network connection,
+typically TCP on an Ethernet. It typically runs as user root and
+multiplexes access to multiple Plan 9 clients over the single wire.
+It assumes Plan 9 uids match Unix login names, and changes to the
+corresponding Unix effective uid when processing requests. U9fs
+serves both 9P1 (the 9P protocol as used by the second and third
+editions of Plan 9) and 9P2000.