1.Startup or shutdown R12

$INST_TOP/apps/$CONTEXT_NAME/logs/appl/admin/log  //message text file

$INST_TOP/apps/$CONTEXT_NAME/logs/ora/                     //tech stack

$CONTEXT_NAME/logs/ora/10.1.2/network/                         //Listener

$INST_TOP/apps/$CONTEXT_NAME/logs/appl/conc/log  //CM

2.Clone

source /target instance:

$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/              //db tier

$INST_TOP/apps/$CONTEXT_NAME/admin/log/                 //apps tier

3.Patch

$APPL_TOP/admin/$SID/log/                                                //apps tier patch

$ORACLE_HOME/.patch_storage                       //(Forms & Reports 10.1.2) 

$IAS_ORACLE_HOME/.patch_storage             //Web Server (Apache)

$ORACLE_HOME/.patch_storage                   //Database Tier opatch log

 4.Autoconfig

$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/MMDDHHMM/       //dbtier

 $INST_TOP/apps/$CONTEXT_NAME/admin/log/$MMDDHHMM        //appstier

5.Tech Stack Patch 10.1.3 (Web/HTTP Server)
$IAS_ORACLE_HOME/j2ee/forms/logs
$IAS_ORACLE_HOME/j2ee/oafm/logs
$IAS_ORACLE_HOME/j2ee/oacore/logs
$IAS_ORACLE_HOME/opmn/logs
$IAS_ORACLE_HOME/network/log
$INST_TOP/logs/ora/10.1.2
$INST_TOP/logs/ora/10.1.3
$INST_TOP/logs/appl/conc/log
$INST_TOP/logs/appl/admin/log

6.Application Tier
$ORACLE_HOME/j2ee/DevSuite/log
$ORACLE_HOME/opmn/logs
$ORACLE_HOME/network/logs