Describe fossil.
 [rsc] --rw-rw-r-- M 197601 glenda sys 1392 Nov  2 01:13 sys/man/6/users
	/n/sourcesdump/2005/1102/plan9/sys/man/6/users:8,18 - 
	/n/sourcesdump/2005/1103/plan9/sys/man/6/users:8,16
	  by convention.
	  Each line in the file has the format
	  .IP
	- .IB num : name : leader :\fImembers\fP
	+ .IB id : name : leader :\fImembers\fP
	  .PP
	  where
	- .I num
	- is a decimal integer,
	  .I name
	  and
	  .I leader
	/n/sourcesdump/2005/1102/plan9/sys/man/6/users:46,69 - 
	/n/sourcesdump/2005/1103/plan9/sys/man/6/users:44,75
	  are ignored.
	  .PP
	  The
	- .I num
	- in a line is a number used internally by a file server;
	- there should be no duplicate
	- .IR num s
	+ .I id
	+ in a line is an identifier used in the on-disk structures maintained
	+ by a file server; there should be no duplicate
	+ .IR id s
	  in the file.
	- A negative
	- .I num
	+ In
	+ .IR fossil (4),
	+ .IR id s
	+ are arbitrary text strings, typically the same as
	+ .IR name .
	+ In older Plan 9 file servers,
	+ .IR id s
	+ are small decimal numbers.
	+ In those, 
	+ a negative
	+ .I id
	  is special: a user with a negative
	- .I num
	+ .I id
	  cannot attach to the file server.
	  The file
	  .B /adm/users
	  itself is owned by user
	- .IR adm ,
	- having a negative
	- .IR num ,
	+ .I adm
	  and write protected to others,
	  so it can only be changed via console commands.
	  .SH "SEE ALSO"
	  .IR intro (5),
	- .IR stat (5)
	+ .IR stat (5),
	+ .IR fossilcons (8)