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For example, it s used to store your entire web server and ftp server file structures sys: /sys is also a non-standard directory which can be used to store information about the state of your system It s used like /proc, with the difference being that the information in /sys is kept on the hard disk of your server so it s still available after rebooting tmp: As the name suggests, /tmp is used for temporary stuff This is the only directory on the entire system which every user can write to To write to this directory, however, is a bad idea, since its contents can be wiped clean by any process or user without warning var: The last directory on any Linux server is /var This directory mostly contains files created by your server, the content of which can grow very fast.

Figure 4-41. A nonadministrator is still able to access a page they should not be able to view. This is where the simplicity and power of authorization schemes become very useful. You can apply the same IS_ADMIN_USER scheme to an entire page. To do so, edit page 2 of the application and go to the security settings, as shown in Figure 4-42.

For this reason, it s a good idea to keep /var on a separate partition The exact contents of /var depend on what s installed on your system In most cases, you ll find the directory /var/spool where print jobs are spooled before being processed by your server Another important subdirectory of /var is the directory log which contains several log files In a Novell environment, this directory is particular important because the database files used by eDirectory are stored in /var/nds..

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Figure 4-42. Setting the authorization scheme for the entire page Note that the authorization scheme can work independently from any authentication settings you have made for the page. Here, you are not only saying that users need to be authenticated to view this page, but they also need to pass your authorization scheme check, and therefore they must be an administrator. If you now repeat your test and modify the URL for a nonadministrator to navigate directly to page 2, you will see the error message shown in Figure 4-43.

Now that you know which directories are important on your server, the next step is to find out how to manage the files in these directories. The easiest way to do this is by means of a graphical file manager like KDE s Konqueror, shown in Figure 4-15. You don t need a book to learn its intricacies, just click the house icon in the menu bar of the KDE desktop and Konqueror starts automatically. If you really want to manage your server, there is only one way to do it from the console with one of the many commands available. This section discusses the most important commands you need to manage your Linux file system. If you ve worked with DOS in the past, you won t find it too difficult.

The developers brainstorm the tasks as a group. This way, every developer understands what each task means. When a developer later signs up for a task, the developer will be able to estimate it.

The first thing you need to know when working with Linux is how to get an overview of the files on your system. For all you DOS lovers out there, you ll be pleased to know that on most Linux distributions you can use dir to show a listing of your files. This is not the best way to get a file listing, however. Using ls is recommended instead. One of the most frequently used options with this command is l, which shows you all the important properties of your files. ls does have one drawback, unfortunately. If, for example, you use ls l /etc/d* to show all files in /etc/ that start with the letter d, the command will not only show you the name of directories that start with a d, but will also show their contents. If you only want to see the name of the concerned directory, add d to the mix. Thus, you should instead use ls ld /etc/d*.

Figure 4-43. Your error message appears when a nonadministrator tries to access a page protected by an authorization scheme. To properly protect the resources in your application, make sure that when you are restricting the display of certain page element that you also protect the resources for which

Linux commands come with many options. Use the man command to get an overview and explanation Tip of all the available options. You can read more about man and other ways to find information about the commands you use in the section Getting Help later in this chapter.

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