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User quota is a completely different way to apply restrictions to control how users can create files and directories. By using quota, the amount of space that a user can occupy is limited. Configuring user quota is a simple five-step procedure: 1. Install the quota software. 2. Prepare the file system where you want to use quota. 3. Initialize the quota system. 4. Apply quota to users and groups. 5. Start the quota service. Before starting to apply quota, you should first realize how it must be applied. Quotas are always user or group related and apply to a complete volume or partition. That is, if you have one disk in your server, with one partition on it that holds your complete root file system, and you apply a quota of 100 MB for user zeina, this user can create no more than 100 MB of files, no matter where on the file system. When working with quotas, you need to apply a hard limit, a soft limit, and a grace period. The soft limit is a limit that cannot be surpassed on a permanent basis. (The user can create more data than the quota allows on a temporary basis.) The grace period is the length of time that the user can temporarily exceed the soft limit. The hard limit is an absolute limit, and, after it s reached (or when the grace period elapses, whichever is sooner), the user will not be permitted to create new files.

Catch e As Exception Console.WriteLine("Error: " & e.ToString)

Working with soft and hard limits is confusing at first glance, but it has some advantages: if a user has more data than the soft limit allows, she still can create new files and isn t stopped in her work immediately. She will, however, get a warning to create some space before the hard limit is reached.

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Figure 20-12. Exception details 7. Click OK to close the exception s View Detail window, and choose Debug Stop Debugging. 8. To fix this application, you have to modify the XML mapping file created by the Entity Data Model, the NorthwindModel.edmx file you created earlier in the chapter and shown previously in Figures 20-7 and 20-8. To view the XML mapping, navigate to Solution Explorer, right-click NorthwindModel.edmx, and choose the Open With option. From the provided dialog box, select XML Editor and click OK. You will see the XML mapping as shown previously in Figure 20-9. 9. In the opened XML mapping file, navigate to the <!-- SSDL content --> section and modify LastName in the <Property Name="LastName" Type="nvarchar" Nullable="false" MaxLength="20" /> XML tag to EmployeesLastName; the tag should appear as <Property Name="EmployeesLastName" Type="nvarchar" Nullable="false" MaxLength="20" /> after the modification.

Finally, in a Finally block, you closed the data reader and the connection by calling their Close methods. As a general rule, you should close things in a Finally block to be sure they get closed no matter what happens within the Try block.

You can use while to run a command as long as a condition is met. Listing 7-27 shows how while is used to monitor activity of an important process. Listing 7-27. Monitoring Process Activity with while #!/bin/bash # # usage: monitor <processname> while ps aux | grep $1 do sleep 1 done logger $1 is no longer present The body of this script consists of the command ps aux | grep $1. This command monitors for the availability of the process whose name was entered as an argument when starting the script. As long as the process is detected, the condition is met and the commands in the loop are executed. In this case, the script waits 1 second and then repeats its action. When the process is no longer detected, the logger command writes a message to syslog. As you can see from this example, while offers an excellent method to check if something (such as a process or an IP address) still exists. If you combine it with the sleep command, you can start your script with while as a kind of daemon and perform a check repeatedly. For example, the script in Listing 7-28 would write a message to syslog if due to an error the IP address suddenly gets lost. Listing 7-28. Checking if the IP Address Is Still There #!/bin/bash # # script that monitors an IP address # usage: ipmon <ip-address> while ip a s | grep $1/ > /dev/null do sleep 5 done logger HELP, the IP address $1 is gone.

Finally ' Close connection rdr.Close() conn.Close()

s Note The logical model, which represents the database schema, is defined in an XML file using SSDL.

Technically, closing the connection also closes the data reader, but closing both (in the previous order) is another good habit. A connection with an open data reader can t be used for any other purpose until the data reader has been closed.

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