examen linux tema 7

Question 1

Question

Compression on a file works by:

Answer

Removing redundant information
Eliminating gaps within the file
Storing most of the data on removable media and just leaving a pointer
Consolidating multiple files into one
Removing the high order bit from each byte

Question 2

Question

In general, for which of the following would you want to use lossless compression?

Answer

A log file
A movie
A JPEG image
An mp3 audio file
An encrypted email

Question 3

Question

Lossy compression: (choose three)

Answer

Decompresses to an identical version as the original
Is often used with documents
Is often used with images
Usually results better compression than lossless
Sacrifices some quality

Question 4

Question

You type gzip myfile.tar. What happens? (choose two)

Answer

myfile.tar is removed
myfile.tar.gz holds a compressed version of myfile.tar
An error; you forgot to specify the file with –f
myfile.tar is unarchived into the current directory
An error; you forgot to pass the name of the output file

Question 5

Question

How would you obtain output similar to the following? compressed uncompressed ratio uncompressed_name 278168 1016950 72.6% tags

Answer

gunzip –t tags
file tags
gzip –l tags

Question 6

Question

Which command would you use to archive the Documents directory and compress it with bzip2 compression?

Answer

tar –czf documents.tbz Documents
tar –cjf Documents
tar –fzc Documents documents.tbz
tar –cjf documents.tbz Documents
tar –cf Documents documents.tbz

Question 7

Question

Which flag would you pass to tar in order to have it make a new archive?

Answer

–t
-c
–j
-x
-n

Question 8

Question

Which command will show what is inside the compressed tarball with a name of foo.tar.gz?

Answer

tar –tjf foo.tar.gz
tar –tzf foo.tar.gz
tar –lf foo.tar.gz
tar –xf foo.tar.gz
tar –tf foo.tar.gz

Question 9

Question

In the command tar –cvjf foo.tbz a b c, what are a, b, and c?

Answer

File names to be added to the archive
Matching operators; anything starting with a, b, or c will be added
a is the directory that will be prepended to files; b and c are files inside it
Extra flags passed to tar
Nothing; cvjf only expects one parameter

Question 10

Question

Given the command tar –cvjf homedirs.tbz /home, which of the following are true? (choose two)

Answer

The /home directory will be restored with the contents of homedirs.tbz
Only files starting with /home will be extracted from the archive
The command will print out each filename as it is processed
Files that are present in the archive might overwrite files in /home
The output file will be compressed

Question 11

Question

You archived your users’ directories into a file called backup.tar.gz. You then view the archive and see the filenames follow this convention: home/username/somefile

Answer

How will you extract just the files for the user called fred?
tar –tzf /home/fred < backup.tar.gz
tar –tjf backup.tar.gz /home/fred
tar –xjf backup.tar.gz home/fred/
tar –xzf backup.tar.gz home/fred/

Question 12

Question

Which of the following commands will create a zipfile with the contents of your Documents directory?

Answer

zip –cf mydocs.zip Documents
zip –c mydocs.zip Documents
zip -r mydocs.zip Documents
zip mydocs.zip Documents
zip –f mydocs.zip Documents

Question 13

Question

Given a file called documents.zip, how can you see what’s in it without extracting the files?

Answer

showzip documents.zip
zip –lf documents.zip
zip –l documents.zip
unzip –list documents.zip
unzip –l documents.zip

Question 14

Question

Given a file called documents.zip, how can you extract just the files under ProjectX?

Answer

zip –x documents.zip ProjectX
unzip documents.zip | grep ProjectX
unzip –t documents.zip ProjectX
unzip documents.zip ProjectX
unzip documents.zip ProjectX/*

Question 15

Question

You try to compress a file that is already compressed. Which of the following statements is true?

Answer

The file will not be compressed any further than it already was
The compression algorithm needs to be set to the “currently compressed” mode for it to be compressed further
The file will actually be uncompressed
The file will be deleted
The file changed while you were compressing it

Question 16

Question

Which of the following commands can be used to compress a file? (choose three)

Answer

bunzip2
bzip2
gzip
cat
zip

Question 17

Question

The three main modes of tar are: (choose three)

Answer

Copy
List
Compress
Create
Extract

Question 18

Question

In the command tar –czf foo.tar.gz bar, what is the purpose of the f flag?

Answer

Tells tar to read from the file that follows the flag
Tells tar to print the name of each file as it is processed
Tells tar to copy only files, and not directories
Specifies extra compression is to be used
Tells tar to write to the file that follows the flag

Question 19

Question

Which two commands do the same thing? (choose two)

Answer

tar –czf foo.tar.gz foo
tar –c foo | gzip > foo.tar.gz
tar –xzf foo.tar.gz
tar –x foo | gzip
tar –tzf foo.tar.gz

Question 20

Question

The _____ command is normally executed daily to update the database of all files that are on the system.

Answer

updatedb
search
locate
find

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examen linux tema 7

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	Created by Jesus Reyes Real about 4 years ago