Declare variables and give them attributes.
declare [-afFrxi] [-p] [name[=value]]
-a Each name is an array variable.
-f Use function names only.
-F Inhibit the display of function definitions;
only the function name and attributes are printed.
-i The variable is to be treated as an integer;
arithmetic evaluation is performed when the
variable is assigned a value.
-p Display the attributes and values of each name.
When `-p'' is used, additional options are ignored.
-r Make names readonly. These names cannot then be assigned values by subsequent assignment statements
-x Mark each name for export to subsequent commands via the environment.If no names are given, then `declare'' will display the values of variables instead.
Using `+'' instead of `-'' turns off the attribute instead.
When used in a function, declare makes each name local, as with the local command.
The typeset command is supplied for compatibility with the Korn shell; however, it has been deprecated in favor of the declare builtin command.
The return status is zero unless an invalid option is encountered, an attempt is made to define a function using `-f foo=bar'', an attempt is made to assign a value to a readonly variable, an attempt is made to assign a value to an array variable without using the compound assignment syntax , one of the names is not a valid shell variable name, an attempt is made to turn off readonly status for a readonly variable, an attempt is made to turn off array status for an array variable, or an attempt is made to display a non-existent function with `-f''.
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