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Although piping sends the result of a command to another command, redirection sends the result of a command to a file or the contents of a file to a command. As I mentioned, this file can be a text file, but it can also be a special file like a device file. An easy example of redirection is shown in the command ls -l > list_of_files. In this command, the redirector (>) sign will make sure that the result of the ls -l command is redirected to the file list_of_ files. If list_of_files doesn t exist yet, this command creates it. If it already exists, this command overwrites it. If you don t want to overwrite the content of existing files, you should use the double redirector sign (>>) instead of the single redirector sign (>). For example, who > myfile will put the result of the who command (which displays a list of users currently logged in) in the file myfile. If you want to append the result of the free command (which shows information about memory usage on your system) to the same file (myfile), then use free >> myfile. Apart from redirecting output of commands to files, the inverse is also possible when using redirection. In this case, you are redirecting the content of a text file to a command that will use that content as its input. For example, the command mail -s "Hi there" root < . sends a mail to root with the subject line Hi there . Because the mail command always needs a dot at a separate line to indicate the end of the message, in this command the construction < . is used to feed a dot to the mail command.

Similar to pixels, which are the smallest unit that can be drawn on the screen, texels are the smallest unit that can be stored by the graphics processing unit (GPU), and they include color and transparency values size: Stores the sprite s size using XNA s Vector2 class This class has two properties, X and Y, which are used to store the image width and height position: Stores the position of the sprite using XNA s Vector2 class The X and Y properties of the class store the screen coordinates for the sprite For now, this class stores only the sprite properties, and does not include any methods These properties are created using the C# simplified version for defining a get/set structure..

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Queries an XML column or variable based on some XQuery expression and returns the results of the query Queries an XML column or variable and returns a scalar value of the SQL data type Tells you whether the given XQuery expression returns any results Modifies the content of an XML data type column or variable with the help of XML Data Modification Language, discussed later in this chapter Returns XML data as relational data

The mail command is a very useful command to send messages to users on your system. I also use Tip it a lot in shell scripts to send a message to the user root if something goes wrong. To see a list of the messages that you ve received this way, just type mail on the command line. Once you stop viewing your e-mail, press the q key to get out of the list.

The query() method is used to query XML data by using XQuery expressions. Listing 10-33 illustrates how this method is used. Listing 10-33. Using the query() Method SELECT xmldata.query('/Employee[@EmployeeID=2]') FROM xmldocs <Employee EmployeeID="2"> <FirstName>Nancy</FirstName> <LastName> Davolio</LastName> </Employee> The SELECT query uses the query() method on the XmlData column. The query() method accepts a valid XQuery expression and returns the matching nodes. In our example, we fetch the <Employee> element whose EmployeeID attribute value is 1. As you can see, the XQuery syntax is based on XPath syntax.

When using redirection, you should be aware that you can do more than redirect output (technically referred to as STDOUT). Commands may produce error output as well, as in the following example, in which I deliberately made an error (no files that start with a* existed in the current directory): ls -l a* ls: cannot access a*: No such file or directory This error output is technically referred to as STDERR. It is possible to redirect STDERR as well; and you can do this with the 2> construction, which indicates that you are interested in redirecting only error output. For example, the command grep root * 2> err.txt would

The first step in creating a sprite is to include a new image in your game, so you can use it through the Content Pipeline. Choose any image you would like to use for this example, as long as it is in one of the formats supported by XNA (listed in 1). For our example, we used a simple 64 64 pixel image of a blue ball with a magenta background, which we created with Windows Paint and saved as ball.bmp.

have the grep command find the text root in all files in the current directory. Now the redirector 2> err.txt will make sure that all error output is redirected to the file err.txt that will be created for this purpose, whereas STDOUT will be written to the console where the user has issued this command.

The value() method accepts an XQuery expression and returns a scalar (single) value. Listing 10-34 shows the use of this method. Listing 10-34. Using the value() Method SELECT xmldata.value('(/Employee/@EmployeeID)[1]','int') FROM xmldocs WHERE id=1 ----------1

Tip XNA allows you to create transparent sections in your sprite in two ways. You can use an advanced

Note The STDIN, STDOUT, and STDERR can be referred to by numbers as well; STDIN = 0, STDOUT = 1,

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