Splunk Search

Lookup file : add a rule

Zakary_n
Path Finder

Hello,

Got a lookup file looking like this :

USER,GROUP
Peter,group1
Parker,group1
John,group2
Kevin,group2

I'd like to add a line at the end to make a rule "Any other users, put him in group3".

Something which would look like :

USER,GROUP
Peter,group1
Parker,group1
John,group2
Kevin,group2
ANYBODY ELSE,group3

But I'm not sure how to achieve this and haven't found my answer yet.

Thank you for your help.

0 Karma
1 Solution

DavidHourani
Super Champion

Hi @Zakary_n,

Have a look here they have the answer for you!

https://answers.splunk.com/answers/443145/is-it-possible-to-add-a-default-value-for-a-lookup.html

Either make an automatic lookup with a default value.

Or use a combination of lookup + eval or fillnull to backfill empty values of group with your default value like this :

...  | lookup table.csv key OUTPUT result | fillnull result value="default"

Cheers,
David

View solution in original post

DavidHourani
Super Champion

Hi @Zakary_n,

Have a look here they have the answer for you!

https://answers.splunk.com/answers/443145/is-it-possible-to-add-a-default-value-for-a-lookup.html

Either make an automatic lookup with a default value.

Or use a combination of lookup + eval or fillnull to backfill empty values of group with your default value like this :

...  | lookup table.csv key OUTPUT result | fillnull result value="default"

Cheers,
David

Zakary_n
Path Finder

This is what I was looking for. Thank you for the fast answer!

0 Karma

DavidHourani
Super Champion

most welcome @Zakary_n 😉

0 Karma
Get Updates on the Splunk Community!

Enter the Agentic Era with Splunk AI Assistant for SPL 1.4

  🚀 Your data just got a serious AI upgrade — are you ready? Say hello to the Agentic Era with the ...

Feel the Splunk Love: Real Stories from Real Customers

Hello Splunk Community,    What’s the best part of hearing how our customers use Splunk? Easy: the positive ...

Data Management Digest – November 2025

  Welcome to the inaugural edition of Data Management Digest! As your trusted partner in data innovation, the ...