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What is wrong with the following command? tar cvfb //dev/tape 20
A. You cannot use the c option with the b option.
B. The correct command should be tar -cvfb /dev/tape20.
C. The arguments are not in the same order as the corresponding modifiers.
D. The files to be backed up have not been specified.
Correct Answer: C
Explanation/Reference:
Explanation: The command should read tar cvfb /dev/tape 20 / . The letters c, v, f and b are the ‘modifiers’. The arguments are the options for the modifiers and should be in the same order as the modifiers. The c modifier is to create an archive. The v modifier is for verbose mode. The f modifier specifies the name of the tar file and so needs an ‘argument’ (in this case a tape drive called /dev/tape). The b modifier is used to set a block size and so needs an ‘argument’ (in this case 20). Note that the arguments following the modifiers are in the same order as the modifier. The “f” precedes the b modifier so the arguments have the device before the blocking factor. The arguments must be in the same order as the modifiers, which can sometimes cause a little confusion.
After the modifiers and arguments have been entered, you need to enter the files to be backed up (in this case the root directory ‘/’).
Reference: http://freebooks.boom.ru/view/LinuxUnleashed/ch45/759-762.html
Incorrect Answers
A:You can use the c option with the b option.
B:You don’t need a hyphen (-) when specifying tar options. Furthermore, the files to be backed up haven’t been specified.
D:The files to be backed up have been entered (the root partition ‘/’), but they are entered in the wrong place.
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