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Caution It probably won t surprise you that rm is one of the most dangerous commands you can use on a Linux system. If, for example, you want to wipe the directory /wipeme, including all its contents, and you accidentally type rm rf / wipeme instead of rm rf /wipeme, rm will erase the entire content of your hard disk. Therefore, be extremely careful when using this command.

This user will still not see the Create button, even if he navigates away from the page and then returns to it You would need to tell the user to log out and then back in again in order for his new administrator privileges to be recognized by the application To avoid this, you could modify the authorization scheme so that it is evaluated on each page view Then the next time the user performs an action that displays a page that references the authorization scheme, the authorization scheme will be reevaluated In this case, the user s new administrator privileges would be recognized, so he would not need to log out and log back in As noted earlier, the downside to having authorization schemes reevaluated each time the page is displayed is performance.

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Up to now, only commands used for working with files have been covered, but there are also commands for use with directories. These will prove relatively simple, especially if you ve worked with DOS before. The first is cd, which stands for change directory. Let s say you re in /usr/bin and want to activate /home. Just use cd /home. Need to create a directory Use mkdir. Linux mkdir is even better than DOS md, because in Linux you can use mkdir p /some/new/directory, which not only creates the specified directory but any necessary parent directories needed if they don t already exist. Lastly, there s rmdir, which is a special command that only removes empty directories.

For example, imagine that your application has quite a large user repository and attracts perhaps 1,000 different users throughout the day, each viewing 10 different pages, each with a reference to your authorization scheme That would mean that throughout the course of the day, your authorization scheme is evaluated around 10,000 times..

Sometimes you just need to see the contents of a file. Two great utilities help you just do that. The first is less. If, for example, you want to see the contents of /etc/hosts to see some mappings between IP addresses and host names, use less /etc/hosts. This opens the viewer less in which you can scroll up and down the file. Finished viewing your file Type q to quit using less. less is just one method of viewing files a method which is often too complicated. If you need to see the content of a very small ASCII text file, you can use cat as well. This command just dumps the content of the file on your screen without any possibility of scrolling back or forth through it. If this isn t enough, the command tail will show you just the last lines of a file. tail is useful for monitoring what happens in log files. If you re testing something on your system, use tail f /var/log/messages in another console screen on your desktop. This shows you immediately if any error is generated during your tests. The option f is a useful addition to tail. It not only shows you the last ten lines of the specified file, but keeps the file open. The result is that you know immediately if a new line is added to it.

The Display Product Detail user story involves creating yet another page. When the user selects a specific product from a list of available products, the detail information about that selected product needs to be retrieved from the database, again in the form of a dataset. Also, the availability of the product (number of product units currently available in inventory) needs to be determined. All of this information must be displayed on the page. Figure 12-3 shows the Display Product Detail story tasks.

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