Finding active users in Apps R12

Find application accessing users in apps r12.

open apache log file find the user names and server names.
goto log_home cd $LOG_HOME/10.1.3/Apache/
grep the apache log file find out application accessing usernames

access_log.1503100800

[sreenidba@sreenidba Apache]$ grep -i username access_log.1503100800
10.20dfvd fv [19/Aug/2017:08:46:29 +0530] "GET /OA_HTML/AppsLocalLogin.jsp?langCode=US&username=7df1 HTTP/1.1" 302 780 0 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.3sdudedia Center PC 6.0; Tablet PC 2.0; MANM)"
10.20.127.65 - - [19/Aug/2017:08:46:37 +0530] "POST /OA_HTML/OA.jsp?page=/oracle/apps/fnd/sso/login/webui/MainLoginPG&_ri=0&_ti=1542395888&language_code=US&requestUrl=&username=75dpdlangCode=US&oapc=6&oas=XynOEO7BE53L9TLf6mB9jA.. HTTP/1.1" 302 297 1 "http://sreenidba.sreenidbandia.com:sreenidba/OA_HTML/RF.jsp?function_id=29806&resp_id=-1&resp_appl_id=-1&security_group_id=0&lang_code=US&params=8sIY1xh-ORzMo9H-R0we9ZVHSP83hqjYSDh3i.JNgT5I49yw4.skh.8lnlBrLKGt&oas=pEjyMI7xnBlduVEEFwagww.." "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; MANM)"
10.20.125.164 - - [19/Aug/2017:08:44:37 +0530] "GET /OA_HTML/AppsLocalLogin.jsp?requestUrl=http%3A%2F%2Fsreenidba.sreenidbandia.com%3Asreenidba%2FOA_HTML%2Fjsp%2Ffnd%2Fclose.jsp&cancelUrl=http%3A%2F%2Fsreenidba.sreenidbandia.com%3Asreenidba%2FOA_HTML%2FAppsLogin&langCode=US&username=20677 HTTP/1.1" 302 1422 0 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3)"
10.20.125.164 - - [19/Aug/2017:08:44:43 +0530] "POST /OA_HTML/OA.jsp?page=/oracle/apps/fnd/sso/login/webui/MainLoginPG&_ri=0&_ti=178643341&language_code=US&requestUrl=http%3A%2F%2Fsreenidba.sreenidbandia.com%3Asreenidba%2FOA_HTML%2Fjsp%2Ffnd%2Fclose.jsp&cancelUrl=http%3A%2F%2Fsreenidba.sreenidbandia.com%3Asreenidba%2FOA_HTML%2FAppsLogin&username=20fdfrrCode=US&oapc=2&oas=D6egnq0Hqj5a8BM4kHL9qw.. HTTP/1.1" 302 276 0 "http://sreenidba.sreenidbandia.com:sreenidba/OA_HTML/RF.jsp?function_id=29806&resp_id=-1&resp_appl_id=-1&security_group_id=0&lang_code=US&params=gT7jP8bDs1Ql9RNPkQ.F.PnXL.gtaFgFW8oqODIcnbZPA5k-jLNcomUQTz7PFfLsmBgxZhYXw3a5OXx96z4DtN7nFYn6bjOCmvGUT60dO3.KtZMqgQCbYIEwe5FbhG8rAOkqlKgDHnl.eF1n4WrP5FXpi.WM1atA8WCmrzhrLuUTvp5M61wORZkYsAFEvldnqmSrjXxqph.j5rGU.G5Gqq-