[root@localhost logs]# cat USER.log | awk -F ',' '{ if ($3=="015208") print $0}'| awk -F ',' '{a+=$1}END{ print $3,a}'
015208 7
[root@localhost logs]# tail -10 USER.log
3,20200313 06:19:24.737,016019,15205833878,192.168.1.103,10000,null
3,20200313 06:20:47.281,016019,15205833878,192.168.1.103,10000,null
3,20200313 06:21:32.875,016019,15205833878,192.168.1.103,10000,null
3,20200313 06:23:45.803,016019,15205833878,192.168.1.103,10000,null
1,20200313 06:26:45.632,016019,15205833878,172.24.15.47,10000,null
3,20200313 06:28:15.180,010020,18505791182,192.168.1.121,10000,null
1,20200313 06:30:17.616,016020,18042098085,192.168.1.145,10000,null
3,20200313 06:32:14.406,016019,15205833878,192.168.1.103,10000,null
3,20200313 06:32:14.406,015208,15205833878,192.168.1.103,10000,null
4,20200313 06:32:14.406,015208,15205833878,192.168.1.103,10000,null