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Command: utmp | Section: 5 | Source: UNIX v7 | File: utmp.5
UTMP(5) File Formats Manual UTMP(5)
NAME
utmp, wtmp - login records
SYNOPSIS
#include <utmp.h>
DESCRIPTION
The utmp file allows one to discover information about who is currently
using UNIX. The file is a sequence of entries with the following
structure declared in the include file:
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 time(2).
The wtmp file records all logins and logouts. Its format is exactly
like utmp except that a null user name indicates a logout on the asso-
ciated terminal. Furthermore, 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 date command has changed the system's idea
of the time.
Wtmp is maintained by login(1) and init(8). Neither of these programs
creates the file, so if it is removed record-keeping is turned off. It
is summarized by ac(1).
FILES
/etc/utmp
/usr/adm/wtmp
SEE ALSO
login(1), init(8), who(1), ac(1)
UTMP(5)