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1.1 ! root 1: .\" Copyright (c) 1980 Regents of the University of California. ! 2: .\" All rights reserved. The Berkeley software License Agreement ! 3: .\" specifies the terms and conditions for redistribution. ! 4: .\" ! 5: .\" @(#)utmp.5 6.3 (Berkeley) 12/9/86 ! 6: .\" ! 7: .TH UTMP 5 "December 9, 1986" ! 8: .UC 4 ! 9: .SH NAME ! 10: utmp, wtmp \- login records ! 11: .SH SYNOPSIS ! 12: .B #include <utmp.h> ! 13: .SH DESCRIPTION ! 14: The ! 15: .I utmp ! 16: file records information about who is currently using the system. ! 17: The file is a sequence of entries with the following ! 18: structure declared in the include file: ! 19: .RS ! 20: .PP ! 21: .nf ! 22: .so /usr/include/utmp.h ! 23: .fi ! 24: .RE ! 25: .PP ! 26: This structure gives the name of the special file ! 27: associated with the user's terminal, the user's login name, ! 28: and the time of the login in the form of ! 29: .IR time (3C). ! 30: .PP ! 31: The ! 32: .I wtmp ! 33: file records all logins and logouts. ! 34: A null user name indicates a logout on the associated terminal. ! 35: Furthermore, the terminal name `~' indicates that the ! 36: system was rebooted at the indicated time; ! 37: the adjacent pair of entries with terminal names ! 38: `\^|\^' and `{' indicate the system-maintained time just before and just after a ! 39: .I date ! 40: command has changed the system's idea of the time. ! 41: .PP ! 42: .I Wtmp ! 43: is maintained by ! 44: .IR login (1) ! 45: and ! 46: .IR init (8). ! 47: Neither of these programs creates the file, ! 48: so if it is removed record-keeping is turned off. It is summarized by ! 49: .IR ac (8). ! 50: .SH FILES ! 51: /etc/utmp ! 52: .br ! 53: /usr/adm/wtmp ! 54: .SH "SEE ALSO" ! 55: last(1), login(1), who(1), ac(8), init(8)
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