Splunk Search

How to pass a variable as the output column name in the lookup command?

ddelmont
Explorer

Hello,

Having trouble understanding lookups.  Any help would be appreciated.

If I have a table with ID and User columns and run below it works.

|makeresults
|eval ID="1"
|lookup test.csv ID output User

But if I add a second eval and run:

|makeresults
|eval ID="1"
|eval column="User"
|lookup test.csv ID output column

I get and error "Count not find all of the specified destination fields in the lookup table".

I need to be able to evaluate the column before passing it to the lookup command.  Is that possible? 

Thanks!

Labels (1)
Tags (1)
0 Karma

thambisetty
Super Champion

@ddelmont 

yes, you can define field which you would like look up against field from lookup table. Fields mentioned after output/outputnew are output of matched field.

why do you want to define variable in output?

————————————
If this helps, give a like below.
0 Karma

ddelmont
Explorer

So it's only possible to use a variable before the output and not after?  Anyway around this?  Thanks.

0 Karma

thambisetty
Super Champion

@ddelmont 

The lookup syntax is not correct. 

field/column names which are used after output keyword are expected to be in lookup and those field values will be returned if there is any match against the field you specify before output keyword.

The correct syntax is as below:

| lookup <lookup-table-name> <lookup-field1> AS <event-field1>, <lookup-field2> AS <event-field2> OUTPUTNEW <lookup-destfield1> AS <event-destfield1>, <lookup-destfield2> AS <event-destfield2>

https://docs.splunk.com/Documentation/Splunk/8.1.0/SearchReference/Lookup

https://www.youtube.com/watch?v=cwEzgY0lAts 

————————————
If this helps, give a like below.
0 Karma
Get Updates on the Splunk Community!

Improve Your Security Posture

Watch NowImprove Your Security PostureCustomers are at the center of everything we do at Splunk and security ...

Maximize the Value from Microsoft Defender with Splunk

 Watch NowJoin Splunk and Sens Consulting for this Security Edition Tech TalkWho should attend:  Security ...

This Week's Community Digest - Splunk Community Happenings [6.27.22]

Get the latest news and updates from the Splunk Community here! News From Splunk Answers ✍️ Splunk Answers is ...