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Figure 4-13. Because there are so many files in it, /usr has its own subdirectory structure. opt: /usr contains a lot of binaries, many of which are small software packages. Normally, large software installations (like office suites and other sizable programs) are stored in /opt. For example, in Open Enterprise Server you ll find the KDE graphical interface and the Mozilla browser in this directory, while the directory /opt/novell holds most components of Open Enterprise Server.

the drop-down list. Any changes to the authorization scheme will automatically be reflected in any elements that use the scheme.

proc: The directory /proc is a bit odd. This is because it doesn t really exist on the hard disk of your computer. /proc is an interface to the memory of your server. An advanced administrator can use it to tune the working of his server. You can also find a lot of information about your server in the files in this directory. Try, for example, the command cat /proc/cpuinfo (you must be root to do so). This command shows you a lot of information about the processor(s) in your server, as you can see in Figure 4-14.

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At first glance, it might look like you have succeeded in preventing nonadministrators from being able to create new records, since they can no longer access the Create button. However, it s important to note the distinction here between the following: Preventing the user from seeing the button Preventing the user from doing whatever clicking the button would have done When users click the Create button, they are redirected to page 2 of the application, as shown in Figure 4-40, which is the page where they can then create a new record. Also notice in Figure 4-40 that the cache is cleared for page 2. Any page items that are defined on page 2 will have their session state cleared, since you would usually want the page to default to blank entries when you are creating a new record.

root: Normal users have their home directories in /home A system administrator is not a normal user; in a UNIX environment, she is therefore respectfully called superuser Since this user may have some important tools in her home directory, this directory is not in /home with those of other users Instead, the user root uses /root as her home directory There is a good reason for this: on many servers the directory /home is on a separate partition If for any reason you can no longer access this partition, at least user root still has access to her home directory in which she has probably stored some important files srv: The /srv directory isn t generally used on other Linux distributions, but it is used on Open Enterprise Server All the files it contains are for important services.

Now we start breaking up the user stories into tasks. We are going to estimate the tasks in ideal hours, as opposed to the ideal days used when estimating user stories. Each developer gets 26 ideal task points.

Figure 4-40. The Create button redirects the user to page 2 in the application. So, what would happen if a nonadministrator tried to get to page 2 by typing that address into a browser Well, that s easy to test. Simply change the page number specified in the URL of the browser to go to page 2 instead of page 1. In the browser, the URL will contain something like this: http://127.0.0.1:7780/pls/apex/f p=108:1:1269075976651930 where 108 is the application ID, and 1 is the page number. The long number after the page number is the session ID. Modify this URL as follows: http://127.0.0.1:7780/pls/apex/f p=108:2:1269075976651930 and then press the Enter/Return key to submit the URL request to the browser. You will see that a nonadministrator user can still access the page for creating new records, as shown in Figure 4-41.

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