CHKWTMP(1) General Commands Manual CHKWTMP(1)NAME
chkwtmp - check wtmp-file for deleted entries
SYNOPSIS
chkwtmp
DESCRIPTION
Chkwtmp examines the file /var/log/wtmp for entries with no information (containing only null-bytes). If such entries are found the program
prints the time window for the original entry. This is done by displaying the timestamps of the wtmp-entry before and after the deleted
entry.
To run chkwtmp you need read permission on the file /var/log/wtmp. Normally this file is world-readable and no special privileges are
required to run the checker.
FILES
/var/log/wtmp login data base
SEE ALSO wtmp(4), who(1)LIMITATIONS
An entry is recognized as overwritten if the time-information has been overwritten with null-bytes.
This program was designed to run on SunOS 4.x systems only. On other systems the output is undefined...
7th Edition Thu Oct 12 1994 CHKWTMP(1)
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AC(8) BSD System Manager's Manual AC(8)NAME
ac -- display connect time accounting
SYNOPSIS
ac [-d] [-p] [-w file] [users ...]
DESCRIPTION
If the file /var/log/wtmp exists, a record of individual login and logout times are written to it by init(8) and login(8) respectively. The
program ac examines these records and writes the accumulated connect time for all logins to the standard output.
Options available:
-d Display the connect times in 24 hour chunks.
-p Display individual user totals.
-w file
Read raw connect time data from file instead of the default file /var/log/wtmp.
users ...
Display totals for the given individuals only.
If no arguments are given, ac displays the total amount of login time for all active accounts on the system.
The default wtmp file is an infinitely increasing file unless frequently truncated. This is normally done by the daily daemon scripts sched-
uled by cron(8) which rename and rotate the wtmp files before truncating them (and keeping about a weeks worth on hand). No login times are
collected however, if the file does not exist.
FILES
/var/log/wtmp
/var/log/wtmp.[0-7] rotated files
SEE ALSO init(8), sa(8), login(1), utmp(5).
HISTORY
A ac command appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution April 19, 1994 4th Berkeley Distribution