08-15-2002
Not the best way....but it will work - I leave the moving to tmp file and coping over the old to you. $1 would be a parameter passed to the script - you might want to change that, add error checking, ...
#!/bin/ksh
linecount=`wc -l /var/adm/messages|awk '{print $1}'`
echo $linecount
kill_lines=$(($linecount-$1))
tail -$kill_lines /var/adm/messages
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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The utmpx and wtmpx files are extended database files that have superseded the obsolete utmp and wtmp database files.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)