Which command is used to invoke field-value lookups and adds data from a lookup to search results?

The lookup command is specifically designed for invoking field-value lookups and enriching search results with additional data from lookup tables in Splunk. When you use this command, it allows you to match field values in your search results with corresponding values in a lookup file, thus enhancing your data analysis capabilities and providing more context to your findings.

By leveraging the lookup command, you can efficiently augment your dataset with extra fields, making it possible to derive deeper insights or perform more detailed analysis based on the matched data from the lookup table. This ability to join additional information seamlessly into search results is one of the core advantages of using lookups in Splunk for cybersecurity and data analytics tasks.

Other commands like eval can create new fields or calculate values but do not perform lookups. The rex command is used for extracting fields using regular expressions, while the search command filters events based on specific criteria, but neither of these inherently provides the functionality to pull in data from external lookup tables like the lookup command does.