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Figure 13 1. Alphabetic parameters of the chmod command We say mildly intuitive because these codes use a somewhat different vocabulary to describe file ownership. Rather than using the Unix labels owner, group, and world to describe to whom the permissions apply, the alphabetic model uses user (meaning the user who owns the file), group, and other. This shift is often a source of confusion, because both owner (the Unix designation) and other (the chmod designation) begin with the letter O. If you can remember that chmod indicates the permissions of the owner by u (not o!), the rest will follow. Using a selection from the possible parameters, an administrator can set permissions on (or change the mode of) a particular file or set of files with a command like this: chmod o+rw thisfile This command changes the existing permissions on the file thisfile to allow other users (or the world) to read it and write to it. Notice that multiple parameters can be designated. What is most important to notice, however, is this part of the sentence: changes the existing permissions. This style of change simply modifies the existing settings. Users in the other group may or may not have execute permission for thisfile; this command has no control over that permission. Alphabetic notation is thus somewhat more ambiguous than octal notation, which is generally considered preferable because it sets permissions explicitly rather than using addition or subtraction from existing permissions. Octal notation uses the base-8 octal numbering system, with the digits 0 through 7. Figure 13 2 shows the permission values that are combined to create each of those digits.

Java class name of a ValueChangeListener An object that implements the ValueChangeListener interface

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Figure 2 12. Marking input as required However, if the UI Command component still sets the outcome to ok, JSF will go ahead and display the stock result. This is obviously not what you want. You d like to do the following: 1. Redisplay getsymbol.xhtml. 2. Have it display the error message. In order to do step 1, you need to first understand how JSF handles the request when there is any error in the Input Processing phase, such as when no value is provided but the UI Input component is marked as required (see Figure 2 13). Obviously, the UI Input component has no value to set into the web bean. Because the UI Command component doesn t know about the error, it will still schedule the listener. JSF will note the error, skip the Invoke Application phase, and go directly to the Render Response phase. Then the outcome will not have been set and will remain at its initial value of null. JSF will treat it as a signal to not change the current view ID and thus will redisplay the current page.

Figure 13 2. Permission values, used with the octal version of the chmod command The values of whatever permissions are to be assigned are added to form a single digit that constitutes one digit of the octal version of the chmod command. To assign write and execute permissions, for example, you add the values of 2 and 1 to create an octal value of 3. A complete set of octal values is shown in Figure 13 3.

The f:verbatim element creates for a UIComponent a child component that renders its body. In practice, it makes it easy for you to embed HTML code in a JSF module. Table F-19 lists the element s attributes. Table F-19. f:verbatim Attributes

Web Bean Outcome null 1: There is an error while reading the values and validating them. 2: Will not store any values into the web bean.

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