What happens with `-n 1`?

Hello there! Excellent question.

If you use xargs -n 1, it means that xargs will pass only one argument from its input to the command being executed at a time.

Let's use the example from the step:

cat ~/project/more_books.txt | xargs -n 1 echo "Processing book:"

Instead of grouping two books together, the output would look like this:

Processing book: Pride_and_Prejudice
Processing book: The_Catcher_in_the_Rye
Processing book: The_Hobbit
Processing book: Animal_Farm
Processing book: Brave_New_World

Each book title from more_books.txt would be processed individually by the echo command, with a separate "Processing book:" line for each one. This is functionally similar to a while read line loop for simple cases, but xargs is often more efficient.

It's useful when you need to run a command for each individual item, rather than processing them in batches.

Feel free to try it out in your terminal to see the difference!