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utmp(4)								      utmp(4)

  utmp,	wtmp - Login records


  #include <&lt;utmp.h>&gt;


  The utmp file	records	information about who is currently using the system.
  The file is a	sequence of utmp entries, as defined in	struct utmp in the
  utmp.h file.

  The utmp structure gives the name of the special file	associated with	the
  user's terminal, the user's login name, and the time of the login in the
  form of time(3).  The	ut_type	field is the type of entry, which can specify
  several symbolic constant values. The	symbolic constants are defined in the
  utmp.h file.

  The wtmp file	records	all logins and logouts.	 A null	user name indicates a
  logout on the	associated terminal.  A	terminal referenced with a tilde (~)
  indicates that the system was	rebooted at the	indicated time.	 The adjacent
  pair of entries with terminal	names referenced by a vertical bar (|) or a
  right	brace (}) indicate the system-maintained time just before and just
  after	a date command has changed the system's	time frame.

  The wtmp file	is maintained by login(1) and init(8).	Neither	of these pro-
  grams	creates	the file, so, if it is removed,	record keeping is turned off.
  See ac(8) for	information on the file.






  ac(8), init(8), last(8), lastcomm(8),	login(1), who(1), wtmpconvert(8).