opensolaris man page for utmp

utmp(4) 							   File Formats 							   utmp(4)

NAME
       utmp, wtmp - utmp and wtmp database entry formats

SYNOPSIS
       #include <utmp.h>
       /var/adm/utmp
       /var/adm/wtmp

DESCRIPTION
       The  utmp and wtmp database files are obsolete and are no longer present on the system.	They have been superseded by the extended database
       contained in the utmpx and wtmpx database files.  See utmpx(4).

       It is possible for /var/adm/utmp to reappear on the system. This would most likely occur if a third party application that still uses  utmp
       recreates  the  file if it finds it missing. This file should not be allowed to remain on the system. The user should investigate to deter-
       mine which application is recreating this file.

SEE ALSO
       utmpx(4)

SunOS 5.11							    22 Feb 1999 							   utmp(4)