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Ubuntu Server uses the kernel to address and control the machine s hardware. The kernel can be considered the heart of the operating system. Ubuntu Server gives users the shell interface to tell this kernel and the services running on top of it what they should do. This interface interprets the commands that users type and translates them to machine code. Several shells are available. The very first shell that was ever created for UNIX, back in the 1970s, was the Bourne shell. It is still available in Linux as the program file /bin/sh. Another popular shell available with Ubuntu is Bash (short for the Bourne Again Shell). The Bash shell is completely compatible with the original Bourne shell, but it has many enhancements. Bash is used as the default shell for the user root, but not for normal users. You can, however, make sure that all users get it by default as well, which I would highly recommend because it offers such great features. You ll read how to do that in 5, but you should be aware that other shells are available as well. Some people prefer using other shells, three of which I ll merely mention here: tcsh: A shell with a scripting language that works like the C programming language (and thus fairly popular with C programmers). zsh: A shell that is compatible with Bash, but offers even more features. sash: The stand-alone shell. This is a very minimal shell that runs in almost all environments. It is thus very well suited for troubleshooting systems.

Write a query displaying the first name and last name from the Person.Person table all in uppercase. SELECT UPPER(FirstName) AS FirstName, UPPER(LastName) AS LastName FROM Person.Person;

The function is an element that can be very useful in longer shell scripts. A function is a subroutine in a script that is labeled with a name. Using functions makes it easier to refer to certain command sequences that have to be used more than once in a script. For instance, you could create a generic error message if something went wrong. You can define functions in two ways. You can use something like: function functionname { command1 command2 commandn }

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:flow="http://www.springframework.org/schema/webflow-config" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/webflow-config http://www.springframework.org/schema/webflow-config/spring-webflow-config-1.0.xsd"> The flow registry allows you to specify a set of flow configuration files, as shown in Listing 6-20. These are where the actual user journeys are defined.

The product number in the Production.Product contains a hyphen (-). Write a query that uses the SUBSTRING function and the CHARINDEX function to display the characters in the product number following the hyphen. Note: there is also a second hyphen in many of the rows; ignore the second hyphen for this question. Hint: Try writing this statement in two steps, the first using the CHARINDEX function and the second adding the SUBSTRING function. --Step 1 SELECT ProductNumber, CHARINDEX('-',ProductNumber) FROM Production.Product; --Step 2 SELECT ProductNumber, SUBSTRING(ProductNumber,CHARINDEX('-',ProductNumber)+1,25) AS ProdNumber FROM Production.Product;

Or you could do it this way: functionname () { command1 command2 commandn } To increase the readability of a script, it s a good idea to use functions if certain code sequences are needed more than once. Listing 7-33 is an example of a script in which a function is used to display an error message. This script is a replacement for the file command, with the difference that the script displays a more elegant error message. Listing 7-33. Displaying Error Codes Using Functions #!/bin/bash # This script shows the file type # # usage: filetype $1 function noarg { echo "You have made an error" echo "When running this script, you need to specify the name of the file" echo "that you want to check" exit 1 } if [ -z $1 ]; then noarg else file $1 fi exit 0 In Listing 7-33, the function has the name noarg. In it, some text is specified that has to be echoed to the screen when the function is called. The function basically defines an error message, and so it makes sure that the script terminates with an exit status of 1. As you can see, the function is called just once in this script, when a user forgets to enter the required argument.

Use the AdventureWorks2008 database to complete Exercise 3-4. 1. Write a query that calculates the number of days between the date an order was placed and the date that it was shipped using the Sales.SalesOrderHeader table. Include the SalesOrderID, OrderDate, and ShipDate columns. SELECT SalesOrderID, OrderDate, ShipDate, DATEDIFF(d,OrderDate,ShipDate) AS NumberOfDays FROM Sales.SalesOrderHeader; 2. Write a query that displays only the date, not the time, for the order date and ship date in the Sales.SalesOrderHeader table.

Let s discuss one more script, one that provides a rather complex example in which process activity is monitored (see Listing 7-34). To do this, the script will periodically check the most active process and, if this script s activity rises above a threshold, it will send an e-mail to the user root.

<flow:registry id="flowRegistry"> <flow:location path="classpath:**-flow.xml"/> </flow:registry> Note that the flow registry will use the filename of the flow configuration file to determine the flow name that will be used to identify it. In the example application, the web flow declaration for the flow to create a new user is in the file createUser-flow.xml on the classpath, so its flowId is therefore createUser-flow. The flow configuration files use the same schema namespace as was used to declare the registry and executor, but as you are declaring them in an external configuration file, you would not normally need to include the general Spring schema options. Listing 6-21 shows you the typical schema definition.