Ask for an explanation of a linux command

< hr >

cat /usr/local/var/log/nginx/access.log|sort -nrk9|head -2

< hr >

what I wonder about is sort-nrk9;
-nrk. I know what this 9 means. What does this 9 stand for?
here is the format of nginx log

log_format  main  "$remote_addr - $remote_user [$time_local] "$request" "
                       "$upstream_response_time "
                       "$status $body_bytes_sent "$http_referer" "
                       ""$http_user_agent" "$http_x_forwarded_for"";

Linux java php

May.31,2021

sort the lines of the log file in reverse numerical order in the ninth column, and finally output the first two lines

in fact, there are three commands here: cat, sort, and head.
for you, 9 is the sorted column

has reference http://blog.chinaunix.net/uid.

this means sorting by the ninth column of each row

by the ninth column of each row

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