Chapter 4. Building Blocks
When you’re young, you learn numbers, and then later you learn how to combine and work with those numbers using symbols such as +, –, ×, and =. So far in this book, you’ve learned several commands, but each one has been run one at a time. Commands can actually be combined in more complex and more interesting ways, however, using various symbols such as
<. This chapter takes a look at those building blocks that enable you to do some useful things with the commands you’ve learned and the commands you’ll be examining in greater detail in subsequent chapters.
Run Several Commands Sequentially
What if you have several commands you need to run consecutively, but some of them are going to take a long time, and ...