题目:
获得访问前10位的ip地址
答案：
awk '{print $1}' access.log | sort | uniq -c | sort
access.log
172.16.8.11 - - [19/Sep/2018:12:35:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7613
172.16.8.1 - - [19/Sep/2018:12:43:08 +0800] "GET /images/loading.gif HTTP/1.1" 200 404
172.16.8.1 - - [19/Sep/2018:12:43:08 +0800] "POST /init HTTP/1.1" 200 207
172.16.8.1 - - [19/Sep/2018:12:43:12 +0800] "POST /init HTTP/1.1" 200 207
172.16.8.1 - - [19/Sep/2018:12:43:16 +0800] "GET / HTTP/1.1" 200 7612
172.16.8.1 - - [19/Sep/2018:12:43:16 +0800] "GET /css/default-init.css?1537325099834 HTTP/1.1" 304 -
172.16.8.1 - - [19/Sep/2018:12:43:16 +0800] "GET /js/lib/jquery/jquery.min.js HTTP/1.1" 304 -
172.16.8.1 - - [19/Sep/2018:12:43:16 +0800] "GET /images/logo.png HTTP/1.1" 304 -
172.16.8.11 - - [19/Sep/2018:12:45:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:12:55:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:13:05:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:13:15:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7613
172.16.8.11 - - [19/Sep/2018:13:25:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7613
172.16.8.11 - - [19/Sep/2018:13:35:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7613
172.16.8.11 - - [19/Sep/2018:13:45:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7613
172.16.8.11 - - [19/Sep/2018:13:55:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:14:05:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:14:15:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:14:25:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:14:35:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7612
172.16.8.11 - - [19/Sep/2018:14:45:21 +0800] "GET /console/stat/onlineVisitorRefresh HTTP/1.1" 200 7613
uniq 命令只能合并相邻相同选项的行，所以前面需要用一个sort排序把相同或者相似的项排在一起。