This system has a oracle directory but I am not able to find the admin and udump/bdump directories. Could someone tell why they are not existing? I searched for udump but didn't find it.

/GN/opt/oracle has the following (but not the admin)

JRE doc jdbc jsp lib64 ocommon ord owm rdbms slax
assistants install jlib ldap lost+found oraInventory otrace plsql relnotes sqlplus
bin javavm jre lib network oracore oui precomp root.sh xdk