关于数组下标 变量截取值

txnet

Nov 23 00:00:01 localhost haproxy[2411]: 36.1.122.217:3392 [23/Nov/2013:00:00:01.242] web users/web_1 20/0/1/101/122 200 15927 - - ---- 416/416/5/3/0 0/0 {haikou.273.cn|http://hainan.273.cn/} "GET /car/7727110.html HTTP/1.1"
Nov 23 00:00:01 localhost haproxy[2411]: 66.249.74.171:45004 [23/Nov/2013:00:00:01.370] web Googlebot/bot_1 0/0/0/0/0 301 408 - - ---- 416/416/1/1/0 0/0 {0712.273.cn|} "GET /suzuki/lc_M6/ HTTP/1.1"
Nov 23 00:00:01 localhost haproxy[2411]: 125.79.52.209:4867 [22/Nov/2013:23:59:55.874] web users/web_1 5325/0/0/186/5512 200 27418 - - ---- 417/417/4/2/0 0/0 {fjcar.273.cn|http://fjcar.273.cn/ps/M1/} "GET /ps/M1_C1/ HTTP/1.1"

按IP 求总量
awk '{a[$6]+=$12}END{for (i in a){print i,a/1024/1024"M"}}' haproxy.log-20131123

现在情况是这样36.1.122.217:3392  多了一个:3392 端口我用下面方法相去掉端口 36.1.122.217:3392   --> 36.1.122.217 但失败了 求方法
awk '{a[${6##:}]+=$12}END{for (i in a){print i,a/1024/1024"M"}}' haproxy.log-20131123

txnet

感谢大家 这个BBS太强大了！