11374379
Description
Quiz by brayhan gutierrez cespedes, updated more than 1 year ago
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Created by brayhan gutierrez cespedes
almost 7 years ago
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Question 1
Question
Compression on a file works by:
Answer
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Removing redundant information
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Eliminating gaps within the file
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Storing most of the data on removable media and just leaving a pointer
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Consolidating multiple files into one
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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
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A log file
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A movie
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A JPEG image
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An mp3 audio file
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An encrypted email
Question 3
Question
Lossy compression:
Answer
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Decompresses to an identical version as the original
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Is often used with documents
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Is often used with images
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Usually results better compression than lossless
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Sacrifices some quality
Question 4
Question
You type gzip myfile.tar. What happens?
Answer
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myfile.tar is removed
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myfile.tar.gz holds a compressed version of myfile.tar
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An error; you forgot to specify the file with –f
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myfile.tar is unarchived into the current directory
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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
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gunzip –t tags
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file tags
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gzip –l tags
Question 6
Question
Which command would you use to archive the Documents directory and compress it with bzip2 compression?
Answer
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tar –czf documents.tbz Documents
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tar –cjf Documents
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tar –fzc Documents documents.tbz
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tar –cjf documents.tbz Documents
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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
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–t
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-c
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–j
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-x
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–n
Question 8
Question
Which command will show what is inside the compressed tarball with a name of foo.tar.gz?
Answer
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tar –tjf foo.tar.gz
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tar –tzf foo.tar.gz
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tar –lf foo.tar.gz
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tar –xf foo.tar.gz
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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
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File names to be added to the archive
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Matching operators; anything starting with a, b, or c will be added
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a is the directory that will be prepended to files; b and c are files inside it
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Extra flags passed to tar
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Nothing; -cvjf only expects one parameter
Question 10
Question
Given the command tar –cvjf homedirs.tbz /home, which of the following are true?
Answer
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The /home directory will be restored with the contents of homedirs.tbz
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Only files starting with /home will be extracted from the archive
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The command will print out each filename as it is processed
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Files that are present in the archive might overwrite files in /home
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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
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How will you extract just the files for the user called fred?
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tar –tzf /home/fred < backup.tar.gz
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tar –tjf backup.tar.gz /home/fred
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tar –xjf backup.tar.gz home/fred/
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tar –xzf backup.tar.gz home/fred/
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tar –xzf backup.tar.gz fred
Question 12
Question
Which of the following commands will create a zipfile with the contents of your Documents directory?
Answer
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zip –cf mydocs.zip Documents
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zip –c mydocs.zip Documents
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zip -r mydocs.zip Documents
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zip mydocs.zip Documents
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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
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showzip documents.zip
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zip –lf documents.zip
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zip –l documents.zip
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unzip –list documents.zip
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unzip –l documents.zip
Question 14
Question
Given a file called documents.zip, how can you extract just the files under ProjectX?
Answer
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zip –x documents.zip ProjectX
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unzip documents.zip | grep ProjectX
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unzip –t documents.zip ProjectX
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unzip documents.zip ProjectX
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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
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The file will not be compressed any further than it already was
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The compression algorithm needs to be set to the “currently compressed” mode for it to be compressed further
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The file will actually be uncompressed
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The file changed while you were compressing it
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The file will be deleted
Question 16
Question
Which of the following commands can be used to compress a file?
Answer
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bunzip2
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bzip2
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gzip
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zip
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cat
Question 17
Question
The three main modes of tar are:
Answer
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Copy
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List
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Compress
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Extract
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Create
Question 18
Question
In the command tar –czf foo.tar.gz bar, what is the purpose of the f flag?
Answer
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Tells tar to read from the file that follows the flag
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Tells tar to print the name of each file as it is processed
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Tells tar to copy only files, and not directories
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Specifies extra compression is to be used
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Tells tar to write to the file that follows the flag
Question 19
Question
Which two commands do the same thing?
Answer
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tar –czf foo.tar.gz foo
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tar –c foo | gzip > foo.tar.gz
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tar –xzf foo.tar.gz
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tar –x foo | gzip
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tar –tzf foo.tar.gz
Question 20
Question
The [blank_start]updatedb[blank_end] command is normally executed daily to update the database of all files that are on the system.
Answer
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updatedb
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search
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locate
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find
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