You are previewing The Linux Command Line.

The Linux Command Line

Cover of The Linux Command Line by William E. Shotts Jr. Published by No Starch Press

Chapter 34. Strings and Numbers

Computer programs are all about working with data. In past chapters, we have focused on processing data at the file level. However, many programming problems need to be solved using smaller units of data such as strings and numbers.

In this chapter, we will look at several shell features that are used to manipulate strings and numbers. The shell provides a variety of parameter expansions that perform string operations. In addition to arithmetic expansion (which we touched upon in Chapter 7), there is a common command-line program called bc, which performs higher-level math.

Parameter Expansion

Though parameter expansion came up in Chapter 7, we did not cover it in detail because most parameter expansions are used in ...

The best content for your career. Discover unlimited learning on demand for around $1/day.