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Quiz on examen linux tema 7, created by Jesus Reyes Real on 28/11/2016.

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examen linux tema 7

Question 1 of 20

1

Compression on a file works by:

Select one or more of the following:

  • 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

Explanation

Question 2 of 20

1

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

Select one or more of the following:

  • A log file

  • A movie

  • A JPEG image

  • An mp3 audio file

  • An encrypted email

Explanation

Question 3 of 20

1

Lossy compression:
(choose three)

Select one or more of the following:

  • 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

Explanation

Question 4 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 5 of 20

1

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

Select one or more of the following:

  • gunzip –t tags

  • file tags

  • gzip –l tags

Explanation

Question 6 of 20

1

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

Select one or more of the following:

  • tar –czf documents.tbz Documents

  • tar –cjf Documents

  • tar –fzc Documents documents.tbz

  • tar –cjf documents.tbz Documents

  • tar –cf Documents documents.tbz

Explanation

Question 7 of 20

1

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

Select one or more of the following:

  • –t

  • ­-c

  • –j

  • -x

  • -n

Explanation

Question 8 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 9 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 10 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 11 of 20

1

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

Select one or more of the following:

  • 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/

Explanation

Question 12 of 20

1

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

Select one or more of the following:

  • zip –cf mydocs.zip Documents

  • zip –c mydocs.zip Documents

  • zip -­r mydocs.zip Documents

  • zip mydocs.zip Documents

  • zip –f mydocs.zip Documents

Explanation

Question 13 of 20

1

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

Select one or more of the following:

  • showzip documents.zip

  • zip –lf documents.zip

  • zip –l documents.zip

  • unzip –list documents.zip

  • unzip –l documents.zip

Explanation

Question 14 of 20

1

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

Select one or more of the following:

  • zip –x documents.zip ProjectX

  • unzip documents.zip | grep ProjectX

  • unzip –t documents.zip ProjectX

  • unzip documents.zip ProjectX

  • unzip documents.zip ProjectX/*

Explanation

Question 15 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 16 of 20

1

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

Select one or more of the following:

  • bunzip2

  • bzip2

  • gzip

  • cat

  • zip

Explanation

Question 17 of 20

1

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

Select one or more of the following:

  • Copy

  • List

  • Compress

  • Create

  • Extract

Explanation

Question 18 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 19 of 20

1

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

Select one or more of the following:

  • 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

Explanation

Question 20 of 20

1

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

Select one or more of the following:

  • updatedb

  • search

  • locate

  • find

Explanation

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