UTMP(5) UNIX Programmer's Manual UTMP(5) NNAAMMEE utmp, wtmp - login records SSYYNNOOPPSSIISS ##iinncclluuddee <<uuttmmpp..hh>> DDEESSCCRRIIPPTTIIOONN The _u_t_m_p file records information about who is currently using the system. The file is a sequence of entries with the following structure declared in the include file: /* * Copyright (c) 1980 Regents of the University of California. * All rights reserved. The Berkeley software License Agreement * specifies the terms and conditions for redistribution. * * @(#)utmp.h 5.1 (Berkeley) 5/30/85 */ /* * Structure of utmp and wtmp files. * * Assuming the number 8 is unwise. */ struct utmp { char ut_line[8]; /* tty name */ char ut_name[8]; /* user id */ char ut_host[16]; /* host name, if remote */ long ut_time; /* time on */ }; This 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 _t_i_m_e(3C). The _w_t_m_p file records all logins and logouts. A null user name indicates a logout on the associated terminal. Furth- ermore, the terminal name `~' indicates that the system was rebooted at the indicated time; the adjacent pair of entries with terminal names `|' and `{' indicate the system- maintained time just before and just after a _d_a_t_e command has changed the system's idea of the time. _W_t_m_p is maintained by _l_o_g_i_n(1) and _i_n_i_t(8). Neither of these programs creates the file, so if it is removed record-keeping is turned off. It is summarized by _a_c(8). FFIILLEESS /etc/utmp /usr/adm/wtmp Printed 7/9/88 December 9, 1986 1 UTMP(5) UNIX Programmer's Manual UTMP(5) SSEEEE AALLSSOO last(1), login(1), who(1), ac(8), init(8) Printed 7/9/88 December 9, 1986 2