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Figure 12-13. Three possible paths for the SWITCH block Notice that there is now a new row in the Condition section: 1. 2. 3. 0 1 2

he level of power, control, and flexibility that the command line offers UNIX/ Linux users has been one of its most endearing and enduring qualities There is also a flip side to this, though for the uninitiated, the command line can also produce extremes of emotions, including awe, frustration, and annoyance Casual observers of UNIX gurus are often astounded at the results of a few carefully entered commands Unfortunately, this power makes UNIX less intuitive to the average user For this reason, graphical user interface (GUI) front-ends for various UNIX/Linux tools, functions, and utilities have been written More experienced users, however, find that it is difficult for a GUI to present all of the available options Typically, doing so would make the interface just as complicated as the command-line equivalent The GUI design is often oversimplified, and experienced users ultimately return to the comprehensive capabilities of the command line After all has been said and done, the fact remains that it just looks plain cool to do things at the command line Before we begin our study of the command-line interface under Linux, understand that this chapter is far from an exhaustive resource Rather than trying to cover all the tools without any depth, we have chosen to describe thoroughly a handful of tools we believe to be most critical for day-to-day work NOTE For this chapter, we assume that you are logged into the system as a regular user and that the X Window System is up and running If you are using the GNOME desktop environment, for example, you can start a virtual terminal in which to issue commands Right-clicking the desktop should present you with a menu that will allow you to launch a virtual terminal The context-sensitive menu may have a menu option that reads something like Open Terminal or Launch Terminal If you don t have that particular option, look for an option in the main menu that says Run Command After the Run dialog box appears, you can then type the name of a terminal emulator (for example, xterm, gnome-terminal, or konsole) into the Run text box All of the commands you enter in this chapter should be typed into the virtual terminal window.

Perhaps the most interesting of the synchronization classes is Exchanger It is designed to simplify the exchange of data between two threads The operation of an Exchanger is astoundingly simple: it simply waits until two separate threads call its exchange( ) method When that occurs, it exchanges the data supplied by the threads This mechanism is both elegant and easy to use Uses for Exchanger are easy to imagine For example, one thread might prepare a buffer for receiving information over a network connection Another thread might fill that buffer with the information from the connection The two threads work together so that each time a new buffer is needed, an exchange is made Exchanger is a generic class that is declared as shown here: Exchanger<V> Here, V specifies the type of the data being exchanged The only method defined by Exchanger is exchange( ), which has the two forms shown here: V exchange(V buffer) throws InterruptedException V exchange(V buffer, long wait, TimeUnit tu) throws InterruptedException, TimeoutException Here, buffer is a reference to the data to exchange The data received from the other thread is returned The second form of exchange( ) allows a time-out period to be specified The key point about exchange( ) is that it won t succeed until it has been called on the same Exchanger object by two separate threads Thus, exchange( ) synchronizes the exchange of the data

Part II: