I am new to Splunk. Can Someone give me a detailed explanation about how to change the Splunk logo using the *.conf file using terminal step by step?
Are you talking about the login screen or within the Splunk Web UI itself? Either way, you can't do it in a .conf file, that's not where it's stored.
To change it in Splunk Web, see this previous Answers posting.
To change it on the login screen, see this previous Answers posting.
Note that these are not supported changes and they will be overwritten on upgrade.
I am talking about after login in you see at the left top corner splunk> logo that I want to change.
I have searched alot but could not able to find the proper code to do the same.
Plus I do not want to change for particular app I want to do it for all apps everytime I change my app it should show the changedlogo only.
The first link I posted should answer your question, make the change in default. css.