Final answer:
The streamstats command in Splunk calculates and appends statistics to search results in real-time, allowing the tracking of running totals and on-the-fly comparisons to historical data.
Step-by-step explanation:
The streamstats command in Splunk is a statistical processing command used to compute summary statistics for fields, similar to the stats command. However, it differs in that it adds the statistics to every event in a streaming fashion, allowing you to see how the statistics evolve over time or across events. In essence, streamstats calculates and appends statistics to the search results as they are processed, which can be especially useful for running totals or for calculating statistics within a sliding window. One common example of using streamstats is to calculate a cumulative total or to compare current events against historical norms on-the-fly.