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The Read-Only Attribute
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The read-only attribute ensures that the file or folder won t be modified, renamed, or deleted accidentally In Windows, if you try to delete a read-only file, you will receive the following message: In the example below we are using the DOS ATTRIB command to show the files attributes
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C:\WINDOWS\Desktop\test>attrib A R TESTDOC C:\WINDOWS\Desktop\test\testdoc C:\WINDOWS\Desktop\test>del testdoc Access denied
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The Windows Explorer message for this presents the same message under the Windows GUI When you open a read-only file such as a document, you can view the file and make changes However, to save the changes you have made, you must save the document as a new file; the original file will be left intact, and a second file that contains the modifications will be created
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The Hidden Attribute
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Under normal circumstances, hidden files and folders will not be displayed in Windows Explorer or My Computer and will not be listed by the Windows Find feature The idea is that if a user can t see a file, the user won t accidentally change or delete it
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However, by changing the Windows View options, as explained in Exercise 8-2, you can display all files and folders, even if they are marked as hidden These files and folders will appear grayed out to indicate their status It is recommended that you select either the Do Not Show Hidden Files or Do Not Show Hidden or System Files option so that hidden files remain truly hidden If a folder is hidden, the files in the folder cannot be viewed using My Computer or Windows Explorer, even if those files are not marked hidden because if you cannot view a folder, you cannot open it to view the files inside These files will be found by the Find command, however
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The archive attribute selects particular files or folders to back up System backups are explained in the Backup and Restore section in the chapter Briefly, many backup utilities include the option to back up only files marked with the archive attribute By default, Windows applies the archive attribute to all files but not to folders You can, of course, manually add or remove the archive attribute
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The System Attribute
The Windows GUI does not allow you to apply or remove the system attribute from files or folders Rather, files are given the system attribute automatically by the OS or the application, depending on their function Most system files are also given the hidden attribute to keep users from accidentally modifying or deleting them In DOS, you can apply or remove the system attribute, but in Windows, you can only view the presence or absence of the attribute
File-Naming Conventions
In Windows, filenames (and folder names) can be up to 255 characters, including the full path name A full path name includes the drive, folder, and subfolders in which a particular file is located For example, suppose a file called JACKET is located in the WINTER subfolder, which is located in the CLOTHES folder on the C: drive This file s full path name is C:\CLOTHES\WINTER\JACKET The file s name can include letters and numbers, spaces, and several other characters Its name cannot include the following characters: \ / * : | Most files include a filename extension, which is separated from the remainder of the name by a period, that signifies the file s type For example, a file with the SYS extension is a system file The extension is very important because it indicates to Windows which application will open a particular file For example, when you double-click a file with the XLS extension, Windows will launch the Microsoft
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