7131665
Description
Quiz by Jesus Reyes Real, updated more than 1 year ago
|
Created by Jesus Reyes Real
almost 8 years ago
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|
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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