topic Re: How to Filter on Null Values? in Splunk Search

How to Filter on Null Values?

katzr — Mon, 31 Jul 2017 18:49:48 GMT

Hello, I am trying to filter on null values for the field called Device. None of the following searches below work- can you please help me figure out another way to do this?

NOT Device="asterick"
Device!="asterick"
Device=""

Note: I actually put an asterick in the middle of those searches (*) but I typed out asterick because it was changing my formatting of this question

Re: How to Filter on Null Values?

s2_splunk — Mon, 31 Jul 2017 20:29:04 GMT

NOT Device="*" should give you all events that don't have the field "Device". Field names are case-sensitive, is the field you want to filter out exactly called "Device"?

Can you show us a couple of sample events, indicating which ones you don't want?

Re: How to Filter on Null Values?

cmerriman — Mon, 31 Jul 2017 20:34:18 GMT

use |where isnull(Device) to get all events where Device is null and |where isnotnull(Device) or |search Device=*/index=A Device=* to get all events where Device is not null.

Re: How to Filter on Null Values?

DalJeanis — Mon, 31 Jul 2017 21:41:54 GMT

Here's some ways to mark code so that the interface doesn't mess with it.

1) use the code button (101 010) to mark code (works in Chrome)

2) If it is multiple lines, you can put at least four spaces before each line.

3) For small snatches of code, you can use the grave accent "" that is under the tilde(~) on an American keyboard. Place the gave accent before and after the small stretch of code to mark it ascode`.