Explain the following command pipeline, and provide an example use case.
```cat names.txt | cut -f2 | uniq -c | sort -r | head -n3```
The command pipeline performs the following operations:

- Reads a file named names.txt using the command "cat"
- Extracts the second field/column of each line using the command "cut"
- Counts the number of unique occurrences of each extracted field using the command "uniq -c"
- Sorts the output in reverse order using the command "sort -r"
- Selects the top 3 entries using the command "head -n3"

An example use case would be analyzing a CSV file that contains customer information. We can use this pipeline to extract the frequency of customers by their last name, sort them in descending order, and get the top 3 most frequent last names in the file.