Index for Section 4

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utmp(4)
NAME
  utmp, wtmp - Login records

SYNOPSIS
  #include <utmp.h>

DESCRIPTION
  The utmp file records information about who is currently using the system.
  The file is a sequence of utmp entries, as defined in struct utmp in the
  utmp.h file.

  The utmp 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(3).  The ut_type field is the type of entry, which can specify
  several symbolic constant values. The symbolic constants are defined in the
  utmp.h file.

  The wtmp file records all logins and logouts.	 A null user name indicates a
  logout on the associated terminal.  A terminal referenced with a tilde (~)
  indicates that the system was rebooted at the indicated time.	 The adjacent
  pair of entries with terminal names referenced by a vertical bar (|) or a
  right brace (}) indicate the system-maintained time just before and just
  after a date command has changed the system's time frame.

  The wtmp file 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.	See ac(8) for information on the file.

FILES
  /usr/include/utmp.h

  /var/adm/utmp

  /var/adm/wtmp

RELATED INFORMATION
  ac(8), init(8), last(8), lastcomm(8), login(1), who(1), wtmpconvert(8).

Index for Section 4

Alphabetical listing for U

Top of page