Here is a patch that corrects both occurences of "+n" syntax in the file.
-- Lionel
--- /etc/cron.monthly/acct~ 2006-03-23 23:41:51.000000000 +0100 +++ /etc/cron.monthly/acct 2006-09-05 09:43:00.000000000 +0200 @@ -30,7 +30,7 @@ gunzip -c /var/log/wtmp.1.gz > $WTMP fi - ac -f $WTMP /var/log/wtmp.1 -p | sort -nr +1 >> /var/log/wtmp.report + ac -f $WTMP /var/log/wtmp.1 -p | sort -nr -k 1 >> /var/log/wtmp.report echo >> /var/log/wtmp.report last -f $WTMP >> /var/log/wtmp.report @@ -40,7 +40,7 @@ rm -f $WTMP fi else - ac -p | sort -nr +1 >> /var/log/wtmp.report + ac -p | sort -nr -k 1 >> /var/log/wtmp.report echo >> /var/log/wtmp.report last >> /var/log/wtmp.report fi