Splunk Search

How can I pass a variable to the tail command?

Path Finder

...
| tail 200

works fine.
...
| eval tail_value=200
| tail tail_value

throws this error:
Error in 'tail' command: The number of results must be a positive number.

I've used tokens as the tail argument but a simple variable is not recognized. For example:
...
| tail $token_from_dropdown$

works.

We've written a cumbersome work-around, but I know I'm missing the simple solution.

Thanks.

0 Karma
1 Solution

Path Finder

One possibility is to get the dynamic value via a subsearch:

index=_internal | tail [ | stats count | eval search=10 | fields search ]

That will effectively expand to a search that looks like this:

 index=_internal | tail ((10))

So in your case just come up with a subsearch that dynamically obtains your value.

View solution in original post

0 Karma

Path Finder

One possibility is to get the dynamic value via a subsearch:

index=_internal | tail [ | stats count | eval search=10 | fields search ]

That will effectively expand to a search that looks like this:

 index=_internal | tail ((10))

So in your case just come up with a subsearch that dynamically obtains your value.

View solution in original post

0 Karma

Path Finder

Good, simple solution. Thanks.

0 Karma
State of Splunk Careers

Access the Splunk Careers Report to see real data that shows how Splunk mastery increases your value and job satisfaction.

Find out what your skills are worth!