utmp man page on DigitalUNIX

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utmp(4)								       utmp(4)

       utmp, wtmp - Login records

       #include <utmp.h>

       The utmp file records information about who is currently using the sys‐
       tem.  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 indi‐
       cates 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.

       ac(8), init(8), last(8), lastcomm(8), login(1), who(1), wtmpconvert(8).
       delim off


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