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Full Discussion: Script to truncate wtmp files
Top Forums Shell Programming and Scripting Script to truncate wtmp files Post 302903442 by Chubler_XL on Tuesday 27th of May 2014 04:36:34 PM
Old 05-27-2014
Here you keep the last 500 and compress the rest and store in /scratch.

Code:
KEEP=500
DEST=/scratch

# Delete all but last $KEEP lines from wtmp
/usr/lib/acct/fwtmp < /var/adm/wtmp > $DEST/wtmp.out
tail -$KEEP $DEST/wtmp.out | /usr/lib/acct/fwtmp -ci > /var/adm/wtmp

# Keep everything except last $KEEP line in $DEST bzip2 date-stamped file
sed -e :a -e '$d;N;2,'$KEEP'ba' -e 'P;D'  $DEST/wtmp.out | bzip2> $DEST/wtmp_$(date +%Y%m%d).bz2
rm $DEST/wtmp.out

Note: if you don't have bzip2 installed, you could use compress instead
 

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LEARN ABOUT BSD

ac

AC(8)							      System Manager's Manual							     AC(8)

NAME

       ac - login accounting

SYNOPSIS

       /usr/sbin/ac [ -w wtmp ] [ -p ] [ -d ] [ people ] ...

DESCRIPTION

       Ac  produces a printout giving connect time for each user who has logged in during the life of the current wtmp file.  A total is also pro-
       duced.  -w is used to specify an alternate wtmp file.  -p prints individual totals; without this  option,  only	totals	are  printed.	-d
       causes  a printout for each midnight to midnight period.  Any people will limit the printout to only the specified login names.	If no wtmp
       file is given, /usr/adm/wtmp is used.

       The accounting file /usr/adm/wtmp is maintained by init and login.  Neither of these programs creates the file, so if it does not exist	no
       connect-time  accounting  is  done.  To start accounting, it should be created with length 0.  On the other hand if the file is left undis-
       turbed it will grow without bound, so periodically any information desired should be collected and the file truncated.

FILES

       /usr/adm/wtmp

SEE ALSO

       init(8), sa(8), login(1), utmp(5).

4th Berkeley Distribution					 November 16, 1996							     AC(8)
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