3. // 请求总数  
    4.    less main.log | wc -l
    5.    1080577      
    6.    // 平均每秒的请求数
    7.    less main.log | awk '{sec=substr($4,2,20);reqs++;reqsBySec[sec]++;} END{print reqs/length(reqsBySec)}'
    8.    14.0963      
    9.    // 峰值每秒请求数
    10.    less main.log | awk '{sec=substr($4,2,20);requests[sec]++;} END{for(s in requests){printf("%s %s\n", requests[s],s)}}' | sort -nr | head -n 3
    11.    Page Visits  Response Size  Time Spent/req  Moment
    12.    182 10/Apr/2016:12:53:20  
    13.    161 10/Apr/2016:12:54:53
    14.    160 10/Apr/2016:10:47:23
    17. less /data/other/nginx_logs/nginx_error.log | wc -l
    18. less /data/other/nginx_logs/nginx_error.log | awk '{sec=substr($4,2,20);reqs++;reqsBySec[sec]++;} END{print reqs/length(reqsBySec)}'
    19. less /data/other/nginx_logs/nginx_error.log | awk '{sec=substr($4,2,20);requests[sec]++;} END{for(s in requests){printf("%s %s\n", requests[s],s)}}' | sort -nr | head -n 3