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UTMP(5)                       File Formats Manual                      UTMP(5)

NAME
       utmp, wtmp - logged in users, login and logout history

SYNOPSIS
       #include <sys/types.h>
       #include <utmp.h>

DESCRIPTION
       The   files   /etc/utmp  and  /usr/adm/wtmp  respectively  contain  the
       currently logged in users, and the history of logins and logouts.

       Each file is an array of the following structure defined in <utmp.h>:

       struct utmp {
            char           ut_user[8];    /* user name */
            char           ut_line[12];   /* terminal name */
            char           ut_host[16];   /* host name, when remote */
            time_t         ut_time;       /* login/logout time */
       };

       #define ut_name ut_user/* for compatibility with other systems */

       The structure contains more fields than those listed, but they are only
       of  interest  to  init  and  login.   Note  that the ut_name field is a
       compatibility alias for ut_user, it is actually better to use it.

       A login entry is completely specified.   A  logout  entry  has  a  null
       string  for  ut_name.   A shutdown or reboot entry has an ut_line field
       containing a "~" (tilde).  The ut_name field is usually the name of the
       program  that  did  the shutdown, or "reboot" at reboot.  This is a bit
       confusing, but note that there should always be two such  entries.   If
       you  see  just  one  entry  then the system has crashed, if you see two
       entries then the system was properly shut down and later rebooted.

FILES
       /etc/utmp                Currently logged in users.

       /usr/adm/wtmp            History of logins and logouts.

SEE ALSO
       who(1), ttyslot(3).

AUTHOR
       Kees J. Bot (kjb@cs.vu.nl)

                                                                       UTMP(5)
NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | AUTHOR