How to Reduce the size of wtmpx file

Step 1: Introduction

The utmpx and wtmpx files are extended database files that have superseded the obsolete utmp and wtmp database files.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.

Step 2: Create Backup of wtmpx

In order to create a backup of wtmpx first check the disk space in /tmp and then copy the file in /tmp directory

# /usr/lib/acct/fwtmp < /var/adm/wtmpx > /tmp/wtmpx.orig

Step 3: Empty wtmpx file

To empty wtmpx file us the following command

# cat /dev/null > /var/adm/wtmpx

Step 4: Zip original wtmpx file

Create a zip of original wtmpx file using gzip command

# gzip /tmp/wtmpx.orig

Step 5: Copy original wtmpx

Copy original wtmpx file in /var/adm/ for audit purpose

# cp /tmp/wtmpx.orig.gz /var/adm/
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