Working With and Cleaning Out wtmpx

% last

# This example keeps only last 500 records. You might want more on a busy system

% /usr/lib/acct/fwtmp < /var/adm/wtmpx | tail -500 | /usr/lib/acct/fwtmp -ic > /tmp/wtmpx

# Test it
% last -f /tmp/wtmpx

% cat /tmp/wtmpx > /var/adm/wtmpx