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UNIX for Dummies Questions & Answers
truncate wtmp
Post 57691 by zazzybob on Thursday 4th of November 2004 04:57:23 PM
11-04-2004
>/var/adm/wtmp
Is basically saying "redirect nothing's STDOUT to the file /var/adm/wtmp", which is essentially the same as the longhand "cat /dev/null > /var/adm/wtmp" - this is a fairly common method of truncating a file down to 0 bytes.
As for the list of files.... I only administer HP-UX and Linux, so one of the AIXers here will be able to give more info, but for a start anything under /var/adm (or Linux - /var/log) is game. Also, keep your beady eye on /tmp and /var/tmp as these can quickly fill filesystems if not managed properly. Also keep an eye on wayward mail spools filling up (some /var/mail/* others /var/spool/mail/*). I should probably say that I'd rather use some form of log rotation mechanism so that logs are archived x times, rotated and removed (such as logrotate under linux), rather than blithely wiping things out.
Unfortunately the things that fill up systems the fastest are the users
Cheers
ZB
Is basically saying "redirect nothing's STDOUT to the file /var/adm/wtmp", which is essentially the same as the longhand "cat /dev/null > /var/adm/wtmp" - this is a fairly common method of truncating a file down to 0 bytes.
As for the list of files.... I only administer HP-UX and Linux, so one of the AIXers here will be able to give more info, but for a start anything under /var/adm (or Linux - /var/log) is game. Also, keep your beady eye on /tmp and /var/tmp as these can quickly fill filesystems if not managed properly. Also keep an eye on wayward mail spools filling up (some /var/mail/* others /var/spool/mail/*). I should probably say that I'd rather use some form of log rotation mechanism so that logs are archived x times, rotated and removed (such as logrotate under linux), rather than blithely wiping things out.
Unfortunately the things that fill up systems the fastest are the users
Cheers
ZB
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LEARN ABOUT SUNOS
utmpx
utmpx(4) File Formats utmpx(4) NAME
utmpx, wtmpx - utmpx and wtmpx database entry formats SYNOPSIS
#include <utmpx.h> /var/adm/utmpx /var/adm/wtmpx DESCRIPTION
The utmpx and wtmpx files are extended database files that have superseded the obsolete utmp and wtmp database files. The utmpx database contains user access and accounting information for commands such as who(1), write(1), and login(1). The wtmpx database contains the history of user access and accounting information for the utmpx database. USAGE
Applications should not access these databases directly, but should use the functions described on the getutxent(3C) manual page to inter- act with the utmpx and wtmpx databases to ensure that they are maintained consistently. FILES
/var/adm/utmpx user access and adminstration information /var/adm/wtmpx history of user access and adminstrative information SEE ALSO
getutxent(3C), wait(3C)wait.h(3HEAD) SunOS 5.10 22 Feb 1999 utmpx(4)