Working with Files and FoldersWorking with files and folders under Mac OS X is quite similar to working with them under previous versions. Under Mac OS X, you can move and copy files and folders as in previous versions of the OS. Just drag the folders or files to where you want them to reside. To place a copy of an item in a different folder, hold down the Option key while you drag the item. To duplicate an item (make a copy of it in its current location), select it and select File, Duplicate (or press -D). NOTE The Columns view is one of the more useful for moving files and folders around because it gives you a good view of the entire hierarchy of the volume you are working with. You can also create copies of files and folders using the contextual menu commands and the commands on the Edit menu. You can place a copy of the items in a new location by pasting them there. NOTE
Creating and naming folders is another area in which Mac OS X uses the same model as previous versions. One thing that is new under Mac OS X is the allowable length for folder names, which is now 256 characters. Of course, you aren't likely to ever use a folder name that long because it would be very difficult to read, but at least you have more flexibility with folder names than you did previously. To name a folder or edit its current name, select the folder and press Return. The folder's name becomes highlighted and you can create a new name. Other tasks you do with Mac OS X are similar to previous versions as well, including those discussed in the following three sections. Naming FilesNaming files is very similar to naming folders, with one exception. Because the underlying architecture of the Mac OS has changed, many document names now include filename extensions for example, .doc at the end of a Word document filename. Long known in the PC world, file extensions are a code that helps identify a file's type and thus the application used to view or edit that file. Many Mac OS X applications also use filename extensions; the OS uses these extensions to launch the appropriate application for that document when you open the file.
To understand more about filename extensions under Mac OS X, p. 174. When you name a document from within an application that uses filename extensions, the correct extension is appended automatically to the filename you enter. However, when you rename files on the desktop or in a Finder window, you need to be aware of a filename's extension if it has one (not all applications use an extension). A complication in this is that you can choose to show or hide filename extensions on a file-by-file basis or at the system level. However, filename extensions are almost always in use, whether you can see them or not. Hiding them simply hides them from your view. I wrote "almost always in use" because all Mac OS X applications add filename extensions to files with which they work. And most Classic applications do not use filename extensions. Fortunately, you can use the Info tool to associate applications with specific files so the lack of a proper filename extension is not a significant problem.
To learn how to associate files with specific applications, p. 166. If you want to rename a file that has an extension, you should leave the extension as it is. If you change or remove the extension, the application you use to open the file might not be launched automatically when you try to open the file. The filename extensions you see under Mac OS X include some of the three- or four-letter filename extensions with which you are no doubt familiar, such as .doc, .xls, .html, .jpg, .tiff, and so on. However, there are many, many more filename extensions you will encounter. Some are relatively short, whereas others (particularly those in the system) can be quite long. There isn't really any apparent rhyme or reason to these filename extensions so you just have to learn them as you go. Because you will mostly deal with filename extensions that are appended by an application when you save a document, this isn't a critical task. However, as you delve deeper into the system, you will become more familiar with many of the sometimes bizarre-looking filename extensions Mac OS X uses. NOTE Depending on the file type, some files open properly even if you do remove or change the file's extension. But it is better to be safe than sorry, so you should usually leave the file extension as you find it. You can choose to hide or show filename extensions globally or on an item-by-item basis. To configure filename extensions globally, use the following steps:
To learn how to show or hide filename extensions for specific items, p. 110. Creating and Using AliasesAs with previous versions of the Mac OS, an alias is a pointer to a file, folder, or volume. Open an alias and the original item opens. The main benefits to aliases are that you can place them anywhere on your Mac and that they are very small, so you can use them with little storage penalty. There are several ways to create an alias, including
You might need to find the original from which an alias was created. For example, if you create an alias to an application, you might want to be able to move to that application in the Finder. Do the following:
Occasionally, an alias breaks, meaning your Mac loses track of the original to which the alias points. The most common situation is that you have deleted the original, but it can happen for other reasons as well. When you attempt to open a broken alias, you will see a warning dialog box that provides the following three options:
Trashing Files and FoldersUnder Mac OS X, the Trash is located at the right end of the Dock. Other than that, the Trash mostly works the same way it always has. To move something to the Trash, use one of the following methods:
After you have placed an item in the Trash, you can access it again by clicking the Trash icon on the Dock. A Finder window displaying the Trash directory opens, and you can work with the items it contains. When you want to delete the items in the Trash, do so in one of the following ways:
To permanently disable the warning dialog box when you empty the Trash, perform the following steps:
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