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Possibly the classic example of flow control consists of constructions that use if ... then ... else. Especially if used in conjunction with the test command, this construction offers various interesting possibilities. You can use it to find out if a file exists, if a variable currently has a value, and much more. Listing 7-23 provides an example of a construction with if ... then ... else that can be used in a shell script. Listing 7-23. Using if to Perform a Basic Check #!/bin/bash if [ -z $1 ] then echo You have to provide an argument with this command exit 1 fi echo the argument is $1 The simple check from the Listing 7-23 example is used to see if the user who started your script provided an argument. If he or she didn t, the code in the if loop becomes active, in which case it displays the message that the user needs to provide an argument and then terminates the script. If an argument has been provided, the commands within the loop aren t

Note One reason Windows installation files are often so large is that they typically come with all the system files they need, in case they re not already present on the system. This does not make dependency problems disappear, however. Third-party application installers sometimes overwrite existing libraries with versions that are incompatible with the rest of the system.

The reason that the way we write our SQL statements often doesn t affect the efficiency of a query is that SQL is fundamentally based on relational calculus. The original SQL standards did not even have algebra keywords like INNER JOIN. SQL statements without these algebra keywords describe what the retrieved rows should be like, so they do not have anything to say about how. Let s look at a calculus approach to our question Who entered Open tournaments in 2006 We want to just retrieve some names from the Member table. Forget joins, and think how you would know whether a particular name should be retrieved if you were shown just the three tables and knew nothing about databases or foreign keys or anything. Imagine a finger m tracing down the table as in Figure 3-9.

Dependency management doesn t just mean adding in packages that a piece of software needs. It might also mean removing packages already present on your system. This might need to happen if they re incompatible with new software you want to install, something that s referred to as package conflict. In addition, sometimes you might want to remove a package that other packages rely on, a situation known as reverse dependency. In such a case, the package manager must either stop you from removing that software, to avoid breaking the software that depends on it, or remove the reversedependency packages too. In most cases, the package manager ask you what to do.

executed, and the script will run the line echo the argument is $1, and in this case echo the argument to the user s screen. Also notice how the syntax of the if construction is organized. First, you have to open it with if. Then, separated on a new line (or with a semicolon), then is used. Finally, the if loop is closed with an fi statement. Make sure all those ingredients are used all the time or your loop won t work.