I need to search "Ignoring request to authentication address " text in all the directories.What command need to give?Any assistance reg this will be highly appreciated.
You can use
I presume you mean "find all the files containing the text ...".
is one way and will output lines of the form
for each match.
The dot just after find in the command means "files anywhere beneath the current directory. You can put any directory here like /var/log if you have some idea where the files are, or even / if you want to search absolutely everywhere, which will take absolutely ages.
If you think the files have some kind of name like .log or .txt, you can start off
to narrow it down a bit.