Variables
Like in other high-level progamming languages, variables are used by the Korn shell to store values. Variable names can begin with an alphabetic or underscore character, followed by one or more alphanumeric or underscore characters. Other variable names that contain only digits or special characters are reserved for special variables (called parameters) set directly by the Korn shell. Data types (called attributes) and one-dimensional arrays are also supported by the Korn shell.
Variable/Attribute Assignment Format
| variable= | declare variable and set it to null |
| typeset variable= | declare variable and set it to null. If used within a function, then a local variable is declared. |
| variable=value | assign value to variable |
| typeset variable=value | assign value to variable. If used within a function, then a local variable is declared. |
| typeset –attribute variable=value | assign attribute and value to variable |
| typeset –attribute variable | assign attribute to variable |
| typeset +attribute variable | remove attribute from variable (except readonly) |
Variable/Attribute Listing Format
| typeset –attribute | display a list of variable names and their values that have attribute set |
| typeset +attribute | display a list of variable names that have attribute set |
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