Bourne Shell Variables
A variable is a name that refers to a temporary storage area in memory. A value such as a text string or number is assigned to a variable and can be changed at any time. The Bourne shell uses two types of variables to store values: local and environmental. Each is described in this chapter.
A variable either is set to some particular value or is said to be “unset,” which means it does not exist as a variable. Shell variables are an integral part of shell programming. The shell variable provides the capability to store and manipulate information within a shell program. The variables you use are completely under your control, and you can set or unset any number of variables as needed to perform a particular task.
A variable ...
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