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This chapter is from the book

This chapter is from the book

Sams Teach Yourself Shell Programming in 24 Hours, 2nd EditionSams Teach Yourself Shell Programming in 24 Hours, 2nd Edition

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This chapter is from the book

This chapter is from the book

Sams Teach Yourself Shell Programming in 24 Hours, 2nd EditionSams Teach Yourself Shell Programming in 24 Hours, 2nd Edition

Learn More Buy

Terms

Array Variable An array variable is a variable that groups multiple scalar variables together using a single name. Each of the individual scalar variables is accessed via an index.

Environment The environment is a set of variables that the shell passes to every program it starts.

Environment Variable An environment variable is a variable that is a member of the environment.

Exporting The process of placing a variable in the environment is called exporting.

Local Variable A local variable is a variable that is present within the current instance of the shell. It is not available to programs that are started by the shell.

Read-Only Variable A read-only variable is a variable whose value cannot be changed.

Scalar Variable A scalar variable can hold only one value at a time.

Shell Variable A shell variable is a variable that is set by the shell and is required by the shell to function correctly.

Unsetting Unsetting a variable removes it from the list of variables tracked by the shell.

Variable A variable is a word that holds a value. The value can be any text string.

Variable Substitution Variable substitution is the process by which the shell replaces the name of a variable with its value.

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