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When the Vehicle Assembly component posts a WorkOrder to the AsapVehiclesToInvoice queue, a notification is sent to the Invoicing component, which in a production system would generate the invoice, print it, and send it to the customer. In this simplified case study, the Invoicing component limits itself to displaying some information on the screen about the vehicle ordered, as shown in Figure 13-19.

$ who salapati 8 08:31 rhudson 8 09:04 lthomas 9 15:54 dcampbel 8 16:27 dfarrell 5 07:00 $ whoami oracle $ pts/0 pts/1 pts/3 pts/7 pts/16 Nov Nov Nov Nov Nov

The whoami command indicates who you are logged in as. This may seem trivial, but as a DBA, there will be times when you could be logged into the system using any one of several usernames. It s good to know who exactly you are at a given point in time, in order to prevent the execution of commands that may not be appropriate, such as deleting files or directories. The example shown here indicates that you are logged in as user Oracle, who is the owner of Oracle software running on the UNIX system.

Tip It is always worthwhile to check that you are at the right place in the file structure before you press the Enter key, to avoid running any destructive commands. The following commands will help you control your input at the command line. Under the Korn shell, to retrieve the previous command, all you have to do is press the Esc key followed by typing k. If you want an older command, continue typing k, and you ll keep going back in the command sequence. If you have typed a long sequence of commands and wish to edit it, press the Esc key followed by typing h to go back, or type l to go forward on the typed command line.

Figure 13-19. The UI of the Invoicing component The details regarding the actual generation of an invoice are not of particular interest here and were omitted. The design of the Invoicing component is fairly straightforward and has much in common with the Vehicle Assembly system, as you can see from the wiring diagram in Figure 13-20.

There are many operating system commands, most with several options. Therefore, it s convenient to have a sort of help system embedded right within the operating system so you have the necessary information at your fingertips. UNIX and Linux systems both come with a built-in feature called the man pages, which provide copious information about all the operating system commands. You can look up any command in more detail by typing man followed by the command you want information on, as follows: $ man who This command will then display a great deal of information about the who command and all its options, as well as several examples (see Figure 3-2).

Figure 3-2. Output of the man command In Linux-based systems, you can also use the nifty whatis command to find out what a certain command does. Like the man command, the whatis command is followed by the name of the command you want information about. Here s a simple example: $ whatis whereis (1) -locate the binary, source, and manual page files for a command As you can see, the whatis command offers a quicker and easier way to locate summary information about any command than the more elaborate man pages.

// class FormMain public class FormMain : System.Windows.Forms.Form { // // manages connections to incoming and outgoing message queues Router router; public FormMain() { InitializeComponent(); System.Threading.Thread.CurrentThread.Name = "User Interface";