Rotate a logfile in real time

while(true); do wc -l 92_OQ1_maillog.txt; mv 92_OQ1_maillog.txt 92_OQ1_maillog.txt.`echo $(date '+%m%d%y%N')`; sleep 5400; done;

do a top-down sort of the files and subdirectories (off current) by size

du -sk * | sort -rn