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A data context does what an ADO.NET connection does, but it also does things that a data provider handles. It not only manages the connection to a data source but it translates LINQ requests (expressed in SQO) into SQL, passes the SQL to the database server, and creates objects from the result set.

You have two approaches when creating users from a command-line environment: you can use the useradd command, or you can add users to the relevant configuration files by manually editing these files. Although this second approach editing the configuration files may be useful in an environment in which users are added from a custom-made shell script, it generally is not recommended. The reason for this is probably obvious: an error in the main user configuration files might make it impossible for every user to log in to the server. In this section, I ll discuss how to manage users from the command line using useradd and other related commands such as usermod and userdel. You can edit related configuration files to make creating users easier.

You created a typed table:

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Retrieving data from text columns is just like retrieving it from the smaller character data types. You ll now write a simple console program to see how this works.

If you want to add users from the command line, useradd is just the ticket. And the other commands for user management are just as convenient: useradd: Adds users to the local authentication system usermod: Modifies properties for users userdel: Deletes users properly from a system passwd: Modifies passwords for users Using useradd is simple. In its easiest form, it just takes the name of a user as its argument; thus, useradd zeina creates a user called zeina to the system. However, you better use the option -m as well, because, if you don t, that user will be without a home directory. In most cases, a user should have a home directory because it allows that person to store files somewhere. Unfortunately, if you create a user without a home directory, there s really no easy way to correct this problem later (but see the following tip for the not-so-easy way).

' Create typed table Dim customers As Table(Of Customers) = db.GetTable(Of Customers)()

To retrieve data from text columns, follow these steps: 1. Add a Visual Basic Console Application project named RetrieveText to the solution. 2. Rename Module1.vb to RetrieveText.vb, and replace the code with that in Listing 18-5. Listing 18-5. RetrieveText.vb Imports Imports Imports Imports Microsoft.VisualBasic System System.Data System.Data.SqlClient

A typed table is a collection (of type System.Data.Dlinq.Table(Of T)) whose elements are of a specific type. The GetTable method of the data context specifies the data context to access and where to put the results. Here, you got all the rows (but only four columns) from the Customers table and the data context created an object for each row in the customers typed table.

Did you forget to create a home directory for user zeina and want to create one now First, use Tip

s Data contexts can be strongly typed, and that s the recommended way to use them, but we intentionTip

mkdir /home/zeina to make the directory itself. Then use cd /etc/skel to activate the directory that contains all files that normally need to be present in a user s home directory. Use tar cv . | tar xvC /home/zeina to copy all files including hidden files from this directory to the user s home directory. Next, use chown -R zeina.users /home/zeina to set proper file ownership for all these files. You ve now created a home directory, but wouldn t it have been easier just to use -m

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