7131665
Descripción
Test por Jesus Reyes Real, actualizado hace más de 1 año
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Creado por Jesus Reyes Real
hace casi 8 años
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Pregunta 1
Pregunta
Compression on a file works by:
Respuesta
-
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
Pregunta 2
Pregunta
In general, for which of the following
would you want to use lossless
compression?
Respuesta
-
A log file
-
A movie
-
A JPEG image
-
An mp3 audio file
-
An encrypted email
Pregunta 3
Pregunta
Lossy compression:
(choose three)
Respuesta
-
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
Pregunta 4
Pregunta
You type gzip myfile.tar. What
happens?
(choose two)
Respuesta
-
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
Pregunta 5
Pregunta
How would you obtain output similar to
the following?
compressed uncompressed ratio
uncompressed_name
278168 1016950
72.6% tags
Respuesta
-
gunzip –t tags
-
file tags
-
gzip –l tags
Pregunta 6
Pregunta
Which command would you use to
archive the Documents directory and
compress it with bzip2 compression?
Respuesta
-
tar –czf documents.tbz Documents
-
tar –cjf Documents
-
tar –fzc Documents documents.tbz
-
tar –cjf documents.tbz Documents
-
tar –cf Documents documents.tbz
Pregunta 7
Pregunta
Which flag would you pass to tar in
order to have it make a new archive?
Respuesta
-
–t
-
-c
-
–j
-
-x
-
-n
Pregunta 8
Pregunta
Which command will show what is
inside the compressed tarball with a
name of foo.tar.gz?
Respuesta
-
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
Pregunta 9
Pregunta
In the command tar –cvjf foo.tbz a b c,
what are a, b, and c?
Respuesta
-
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
Pregunta 10
Pregunta
Given the command tar –cvjf
homedirs.tbz /home, which of the
following are true?
(choose two)
Respuesta
-
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
Pregunta 11
Pregunta
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
Respuesta
-
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/
Pregunta 12
Pregunta
Which of the following commands will
create a zipfile with the contents of
your Documents directory?
Respuesta
-
zip –cf mydocs.zip Documents
-
zip –c mydocs.zip Documents
-
zip -r mydocs.zip Documents
-
zip mydocs.zip Documents
-
zip –f mydocs.zip Documents
Pregunta 13
Pregunta
Given a file called documents.zip, how
can you see what’s in it without
extracting the files?
Respuesta
-
showzip documents.zip
-
zip –lf documents.zip
-
zip –l documents.zip
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unzip –list documents.zip
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unzip –l documents.zip
Pregunta 14
Pregunta
Given a file called documents.zip, how
can you extract just the files under
ProjectX?
Respuesta
-
zip –x documents.zip ProjectX
-
unzip documents.zip | grep ProjectX
-
unzip –t documents.zip ProjectX
-
unzip documents.zip ProjectX
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unzip documents.zip ProjectX/*
Pregunta 15
Pregunta
You try to compress a file that is
already compressed. Which of the
following statements is true?
Respuesta
-
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
Pregunta 16
Pregunta
Which of the following commands can
be used to compress a file?
(choose three)
Respuesta
-
bunzip2
-
bzip2
-
gzip
-
cat
-
zip
Pregunta 17
Pregunta
The three main modes of tar are:
(choose three)
Respuesta
-
Copy
-
List
-
Compress
-
Create
-
Extract
Pregunta 18
Pregunta
In the command tar –czf foo.tar.gz bar,
what is the purpose of the f flag?
Respuesta
-
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
Pregunta 19
Pregunta
Which two commands do the same
thing?
(choose two)
Respuesta
-
tar –czf foo.tar.gz foo
-
tar –c foo | gzip > foo.tar.gz
-
tar –xzf foo.tar.gz
-
tar –x foo | gzip
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tar –tzf foo.tar.gz
Pregunta 20
Pregunta
The _____ command is normally
executed daily to update the database
of all files that are on the system.
Respuesta
-
updatedb
-
search
-
locate
-
find
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