1.4.1.4.
Shell parameters
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A parameter is an entity that stores values. It can be a name, a number or a special value. For the shell's purpose, a variable is a parameter that stores a name. A variable has a value and zero or more attributes. Variables are created with the declare shell built-in command.
If no value is given, a variable is assigned the null string. Variables can only be removed with the unset built-in.
Assigning variables is discussed in Section 3.2, advanced use of variables in Chapter 10.
