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The CIPHER command is a bit complex, but in its most basic implementation, it s pretty straightforward Figure 1032 shows two steps in the process Like the COMPACT command, the CIPHER command simply displays the current state of affairs when entered with no switches In this case, it displays the encryption state of the files in the D:\Work Files\Armor Pictures directory Notice the letter U to the left of the filenames, which tells you they are unencrypted The second command you can see on the screen in Figure 1032 is this:
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D:\Work Files\Armor Pictures>cipher /E /A
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Figure 1031
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Typing COMPACT /U DILBERTBMP decompresses only that file
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This time the CIPHER command carries two switches: /E specifies the encryption operation, and /A says to apply it to the files in the directory, not just the directory itself As you can see, the command-line interface is actually pretty chatty in this case It reports that it s doing the encryption and then tells you what it s done, and it even warns you that you should clean up any stray unencrypted bits that may have been left in the directory
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Figure 1032
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Typing CIPHER /E /A encrypts the contents of the directory
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10: Working with the Command-Line Interface
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To confirm the results of the cipher operation, enter the CIPHER command again, as shown in Figure 1033 Note that the U to the left of each filename has been replaced with an E, indicating an encrypted file The other indication that this directory has been encrypted is the statement above the file listing:
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New files added to this directory will be encrypted
Figure 1033
Remember that the CIPHER command works on directories first and foremost, and it works on individual files only when you specifically tell it to do so That s great, but suppose you want to decrypt just one of the files in the Armor Pictures directory Can you guess how you need to alter the comThe CIPHER command confirms that the files were encrypted mand Simply add the filename of the file you want to decrypt after the command and the relevant switches Figure 1034 shows the CIPHER command being used to decipher DCP_0106JPG, a single file
Figure 1034
Typing CIPHER /D /A DCP_0106JPG decrypts only that file
Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)
10 Review
Summary
After reading this chapter and completing the exercises, you should understand the following about the command line characters (/ \ [ ] | + = ; , * ) could be used in the filename or extension The filename and extension are separated by a period, or dot This naming system is known as the eight-dot-three (83) naming system All versions of Windows starting with 9x allow filenames of up to 255 characters
Deciphering the Command-Line Interface
The text-based DOS-like user interface, now known as the command-line interface, still functions as a basic installation and troubleshooting tool for techs in Windows 2000 and XP Windows comes with a text editor called EDIT that enables technicians to manipulate text files from within the command prompt When you use a command-line interface, the computer tells you it s ready to receive commands by displaying a specific set of characters called a prompt You type a command and press ENTER to send it The OS goes off and executes the command, and when it s done it displays a new prompt, often along with some information about what it did Once you get a new prompt, it means the computer is ready for your next instruction You can access the command-line interface by clicking Start | Run to open the Run dialog box, and then typing CMD and pressing ENTER You can also click Start | Programs | Accessories | Command Prompt in Windows 2000 and XP To close the command-line interface window, either click the Close box in the upper-right corner of the window or type EXIT at the prompt and press ENTER The command prompt is always focused on some directory, and any commands you issue are performed on the files in the directory on which the prompt is focused Make sure you focus the prompt s attention on the drive and directory in which you want to work Windows manifests each program and piece of data as an individual file Each file has a name, which is stored with the file on the drive Names are broken down into two parts: the filename and the extension In true DOS, the filename could be no longer than eight characters The extension, which is optional, could be up to three characters long No spaces or other illegal
The filename extension tells the computer the type or function of the file Program files use the extension EXE (for executable) or COM (for command) If the file is data, the extension indicates which program uses that particular data file Graphics files most often reflect the graphics standard used to render the image, such as GIF or JPG Changing the file extension does not change the data in the file The Windows GUI doesn t show the file extensions by default All files are stored on the hard drive in binary format, but every program has its own unique method of binary organization, called a file format One program cannot read another program s files unless it has the ability to convert the other program s file format into its file format ASCII (American Standard Code for Information Interchange) was the first universal file format The ASCII standard defines 256, eight-bit characters, including all the letters of the alphabet (uppercase and lowercase), numbers, punctuation, many foreign characters, box-drawing characters, and a series of special characters for commands such as a carriage return, bell, and end of file ASCII files, often called text files, store all data in ASCII format The keyboard sends the characters you press on the keyboard in ASCII code to the PC Even the monitor outputs in ASCII when you are running a command line As a rule, the OS treats the first 32 ASCII values as commands Some of them are both commands and characters How these first 32 values are treated depends on the program that reads them Unicode supports thousands of 16-bit characters The first 256 Unicode characters are the same as the complete 256 ASCII character set, which maintains backward compatibility
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