UTMP.5
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- UTMP(5) Minix Programmer's 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)
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