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You may find it handy to create a symbolic link from /dev/tape to the appropriate device name for the rewinding mode and a link from /dev/nrtape for the non-rewinding mode (for example, /dev/tape/dev/st0 and /dev/nrtape/dev/nst0) This will make it easier to remember the name of the tape device when issuing commands See 5 for information on using the ln command to create symbolic links What makes these backup device files different from disk files is that there is no file-system structure Files are continuously written to the tape until it s full or until an end-of-file marker is written If a tape device is in non-rewind mode, the write head is left in the position immediately after the last end-of-file marker, ready for the next file to be written Think of tape devices as similar to a book with chapters The book s binding and the paper, like the tape itself, provide a place to put the words (the files) It s the markings of the publisher (the backup application) that separate the entire book into smaller subsections (files) If you (the reader) were an auto-rewinding tape drive, you would close the tape every time you were done with a single file and then have to search through the tape to find the next position (chapter) when you re ready to read it If, however, you were a non-rewinding tape drive, you would leave the tape open to the last page you read

Sample output from the SBDemo applet is shown in Figure 24-6

24:

If you don t have the file /dev/st0 or /dev/nst0, you can create one using the mknod command The major number for SCSI tape drives is 9, and the minor number dictates which drive and whether it is auto-rewinding The numbers 0 through 15 represent drive numbers 0 through 15, auto-rewinding The numbers 128 through 143 represent drive numbers 0 through 15, non-rewinding The tape drive is a character device So, to create /dev/st0, we would type this mknod command:

FIGURE 24-6

The TextField class implements a single-line text-entry area, usually called an edit control Text fields allow the user to enter strings and to edit the text using the arrow keys, cut and paste keys, and mouse selections TextField is a subclass of TextComponent TextField defines the following constructors: TextField( ) throws HeadlessException TextField(int numChars) throws HeadlessException TextField(String str) throws HeadlessException TextField(String str, int numChars) throws HeadlessException The first version creates a default text field The second form creates a text field that is numChars characters wide The third form initializes the text field with the string contained in str The fourth form initializes a text field and sets its width TextField (and its superclass TextComponent) provides several methods that allow you to utilize a text field To obtain the string currently contained in the text field, call getText( ) To set the text, call setText( ) These methods are as follows: String getText( ) void setText(String str) Here, str is the new string The user can select a portion of the text in a text field Also, you can select a portion of text under program control by using select( ) Your program can obtain the currently selected text by calling getSelectedText( ) These methods are shown here: String getSelectedText( ) void select(int startIndex, int endIndex) getSelectedText( ) returns the selected text The select( ) method selects the characters beginning at startIndex and ending at endIndex 1

The make tool reads all of the makefiles that were created by the configure script These files tell make which files to compile and the order in which to compile them which is crucial, since there could be hundreds of source files Depending on the speed of your system, the available memory, and how busy it is doing other things, the compilation process could take a while to complete, so don t be surprised As make is working, it will display each command it is running and all of the parameters associated with it This output is usually the invocation of the compiler and all of the parameters passed to the compiler it s pretty tedious stuff that even the programmers were inclined to automate!

Figure 11-6. If you select the Show option, a small data plug becomes available. Let take a look at another easy Control option for the LOOP block the Forever setting shown in Figure 11-7.

Part II:

If the compile goes through smoothly, you won t see any error messages Most compiler error messages are clear and distinct, so don t worry about possibly missing an error If you do see an error, don t panic Most error messages don t reflect a problem with the program itself, but usually with the system in some way or another Typically, these messages are the result of inappropriate file permissions or files that cannot be found In general, slow down and read the error message Even if the format is a little odd, it may explain what is wrong in plain English, thereby allowing you to quickly fix it If the error is still confusing, look at the documentation that came with the package to see if there is a mailing list or e-mail address you can contact for help Most developers are more than happy to provide help, but you need to remember to be nice and to the point (In other words, don t start an e-mail with a rant about why their software is terrible)