作业 4:
awk '{print $7}' nginx.log |sed 's/[0-9]//g' | sed 's/?.*//g' | sort | uniq -c | sort -rn | head -5
2396 /cable
1812 /topics/
1218 /topics//replies//edit
818 /topics//replies//reply_suggest
442 /
awk '{print $1}' nginx.log | sort | uniq -c | sort -rn | head -5