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One of the strengths of the shell as a programming language is its parsing of command-line arguments and the various expansions it performs on words in the line. When a command is called with arguments, the shell does several things before it invokes the command. To help visualize what happens, the short script shown in Listing 4-1, called sa, will display what the shell has passed to it after processing all the arguments. Each of its arguments is printed on a separate line, preceded by the value of $pre and followed by the value of $post. Listing 4-1. sa; Displaying Command-Line Arguments pre=: post=: printf "$pre%s$post\n" "$@" The special parameter $@ expands to a list of all the command-line arguments, but the results differ depending on whether it is quoted. When quoted, it expands to the positional parameters "$1", "$2", "$3", "$4", and so on, and the arguments containing whitespace will be preserved. If $@ is unquoted, splitting will occur wherever there is whitespace. When a line is executed, whether at the command prompt or in a script, the shell splits the line into words wherever there is unquoted whitespace. Then bash examines the resulting words, performing up to eight types of expansion on them as appropriate. The results of the expansions are passed to the command as its arguments. This chapter examines the entire process, from the initial parsing into words based on unquoted whitespace to each of the expansions in the order in which they are performed: 1. 2. 3. 4. 5. 6. 7. 8. Brace expansion Tilde expansion Parameter and variable expansion Arithmetic expansion Command substitution Word splitting Pathname expansion Process substitution

Submitting Forms Programmatically with drupal_form_submit()

The default behavior of Equals() is to test whether two variables are pointing to the same object in memory Here, you create a new Person variable named p1 At this point, a new Person object is placed on the managed heap p2 is also of type Person However, you are not creating a new instance, but rather assigning this variable to reference p1 Therefore, p1 and p2 are both pointing to the same object in memory, as is the variable o (of type object, which was thrown in for good measure) Given that p1, p2, and o all point to the same memory location, the equality test succeeds Although the canned behavior of SystemObject can fit the bill in a number of cases, it is quite common for your custom types to override some of these inherited methods.

To illustrate, update the Person class to support some properties representing an individual s first name, last name, and age, each of which can be set by a custom constructor: // Remember! Person extends Object class Person { public string FirstName { get; set; } public string LastName { get; set; } public int Age { get; set; } public Person(string fName, string lName, int personAge) { FirstName = fName; LastName = lName; Age = personAge;.

Any form that is displayed in a web browser can also be filled out programmatically. Let s fill out our name and favorite color programmatically: $form_id = 'formexample_nameform'; $form_state['values'] = array( 'user_name' => t('Marvin'), 'favorite_color' => t('green') ); // Submit the form using these values. drupal_form_submit($form_id, $form_state); That s all there is to it! Simply supply the form ID and the values for the form, and call drupal_form_submit().

// Make an array of Shapes. Shape[] myShapes = { new Hexagon(), new Circle(), new Triangle("Joe"), new Circle("JoJo")}; // Get first pointy item. // To be safe, you'd want to check firstPointyItem for null before proceeding. IPointy firstPointyItem = FindFirstPointyShape(myShapes); Console.WriteLine("The item has {0} points", firstPointyItem.Points); ... }

Recall that the same interface can be implemented by numerous types, even if they are not within the same class hierarchy and do not have a common parent class beyond System.Object. This can yield some very powerful programming constructs. For example, assume you have developed three new class types within your current project that model kitchen utensils (via Knife and Fork classes) and another modeling gardening equipment ( la PitchFork). Consider Figure 9-4.

Figure 9-4. Recall that interfaces can be plugged into any type in any part of a class hierarchy If you defined the PitchFork, Fork, and Knife types, you could now define an array of IPointycompatible objects. Given that these members all support the same interface, you can iterate through the array and treat each item as an IPointy-compatible object, regardless of the overall diversity of the class hierarchies: static void Main(string[] args) {

Caution Many submit functions assume that the user making the request is the user submitting the form. When submitting forms programmatically, you will need to be very aware of this, as the users are not necessarily the same.

... // This array can only contain types that // implement the IPointy interface. IPointy[] myPointyObjects = {new Hexagon(), new Knife(), new Triangle(), new Fork(), new PitchFork()}; foreach(IPointy i in myPointyObjects) Console.WriteLine("Object has {0} points.", i.Points); Console.ReadLine(); }