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Script to truncate wtmp files

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# 1  
Old 05-23-2014
Script to truncate wtmp files
Hi,

Does anyone have a script to truncate the wtmp file.

I want to move older entries in the wtmp to a new file and move it out of var/adm and shrink the size.
# 2  
Old 05-26-2014
What OS are you on?

Linux uses logrotated to handle this, on AIX you would use fwtmp and if on Solaris you would most likely use logadm.
# 3  
Old 05-27-2014
I am on AIX.
How to use fwtmp to rotate the logs?
# 4  
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
# 5  
Old 05-28-2014
Thank you for the script.
let me test in one of my server.

---------- Post updated at 09:36 AM ---------- Previous update was at 08:51 AM ----------

It worked. Perfect script.
Thank you very much Chuber XL.
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