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When working on a text file in vi, you may want to delete characters, words, or lines from it. As you ve probably guessed, vi has lots of commands to let you do this. Some can be used to delete the current character (x), the current line (dd), or the rest of the word, starting at the current position of the cursor (dw). Besides these easy commands, you can also delete an entire selection. If, for example, you want to delete everything from line 9 thru line 15, type :9,15d. But how do you know which line numbers you want to work with Easy, use :se number in command mode to display line numbers. Figure 4-21 shows the result of this command. Don t want to see line numbers any more Just use :se nonumber and go on with your work. In fact the delete command (like any other commands that delete text) doesn t really delete anything, it just places the text in a buffer from which you can restore it easily. One way to do so, is with the command u that stands for undo. Another way is to put the cursor somewhere else in your document and paste the selection at the new position of the cursor.

Note In the example, the value used for p_security_group_id is modified so that it fits onto a single

Even if you are an experienced vi user, sometimes things happen that are impossible to understand. Tip

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Any static files that you reference in this way will be downloaded to the end user s browser as a result of making a call to the get_file routine. This approach has two downsides: Each file that you reference in this way will require a separate call to the get_file routine. Quite often, browsers will fail to store the image in their cache. In these cases, the static file will be rerequested every time the page is displayed, resulting in slower loading pages and images that appear to flicker as they are reloaded. You could write your own get_file replacement procedure, which will enable the browser to cache the static files, as you ll learn in 9.

n the previous chapter, we developed an iteration plan for our sample project. Now we re ready to work on the first iteration. This chapter will be mainly from a developer s perspective of the iteration. We will take a quick look at what other XP team members are doing, but the actual output of those roles will not be demonstrated. The goal of this chapter is to demonstrate the developer s XP practices in action. To get your environment prepared for this chapter, you need to walk through the steps outlined in Appendix A. In Appendix A, you will be guided through how to set up a Visual Studio solution with multiple projects. This type of solution/project configuration works well for development projects that have multiple team members.

For instance, you may press the wrong key without knowing it and copy your file s contents about six hundred times. In most situations, u helps you restore the original file prior to pressing this unfortunate key sequence. If u doesn t help, you can always use :q! in command mode. This quits vi immediately. Yes, all the changes you ve made to the file will be lost, but at least you still have the original file.

Storing Static Files on the Server File System Storing files directly on the web server file system will usually make caching the static files happen transparently, since the OHS can add some default expiry headers to the file as it is requested by the user s browser. When the user views the same page again, the user s browser will determine whether the image can be reloaded from the browser cache or it needs to be requested again from the web server. By taking advantage of caching for static files, your application will appear far more responsive to your end users, as well as put less load on your database. The downside of storing static files directly on the file system is that they are not as integrated with your application. For example, you will need to ensure that they were backed up as a separate process, since they would not be backed up as part of the database. You also need to ensure that the file names on the file system correspond to the names you used to reference the files in your application.

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