# zcat auth.log.2.gz | grep "Illegal user" | wc -l 16 # zcat auth.log.1.gz | grep "Illegal user" | wc -l 2089 # zcat auth.log.0.gz | grep "Illegal user" | wc -l 749へー # zcat auth.log.1.gz | grep Illegal | cut -f10 -d" " | sort |uniq -c 1…