€˜-’ turns off the given attribute.
    
    Variables with the integer attribute have arithmetic evaluation (see
    the ‘let’ command) performed when the variable is assigned a value.
    
    When used in a function, ‘declare’ makes NAMEs local, as with the ‘local’
    command.  The ‘-g’ option suppresses this behavior.
    
    Exit Status:
    Returns success unless an invalid option is supplied or a variable
    assignment error occurs.