Two of the commands we used in Chapter 1 are workhorses of the shell scripter’s stable: echo and printf. Both are bash built-in commands. Both print information to the standard output stream, but printf is much more powerful, and echo has its problems.
In this chapter, we will cover echo and the problems it brings, the capabilities of printf, the read command, and the standard input and output streams. We’ll start at first with an overview of parameters and variables.
Parameters and Variables
To quote the bash manual (type ...
