Linux Essentials Chapter 7 Exam

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Linux Essentials Chapter 7 Exam Answer

  1. Question ID 73

    Compression on a file works by:

    • 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
  2. Question ID 75

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

    • A log file
    • A movie
    • A JPEG image
    • An mp3 audio file
    • An encrypted email
  3. Question ID 76

    Lossy compression:

    (choose three)

    • 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
  4. Question ID 77

    You type gzip myfile.tar. What happens?

    (choose two)

    • 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
  5. Question ID 78

    How would you obtain output similar to the following?

    compressed​​     ​​​uncompressed     ratio        uncompressed_name

    278168                1016950                  72.6%           tags

    • gunzip –t tags
    • file tags
    • gzip –l tags
  6. Question ID 79

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

    • tar –czf documents.tbz Documents
    • tar –cjf Documents
    • tar –fzc Documents documents.tbz
    • tar –cjf documents.tbz Documents
    • tar –cf Documents documents.tbz
  7. Question ID 80

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

    • –t
    • -c
    • –j
    • -x
    • –n
  8. Question ID 81

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

    • 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
  9. Question ID 82

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

    • 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
  10. Question ID 83

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

    (choose two)

    • 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
  11. Question ID 84

    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

    • 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/
    • tar –xzf backup.tar.gz fred
  12. Question ID 85

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

    • zip –cf mydocs.zip Documents
    • zip –c mydocs.zip Documents
    • zip -r mydocs.zip Documents
    • zip mydocs.zip Documents
    • zip –f mydocs.zip Documents
  13. Question ID 86

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

    • showzip documents.zip
    • zip –lf documents.zip
    • zip –l documents.zip
    • unzip –list documents.zip
    • unzip –l documents.zip
  14. Question ID 87

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

    • zip –x documents.zip ProjectX
    • unzip documents.zip | grep ProjectX
    • unzip –t documents.zip ProjectX
    • unzip documents.zip ProjectX
    • unzip documents.zip ProjectX/*
  15. Question ID 88

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

    • 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
  16. Question ID 89

    Which of the following commands can be used to compress a file?

    (choose three)

    • bunzip2
    • bzip2
    • gzip
    • cat
    • zip
  17. Question ID 90

    The three main modes of tar are:

    (choose three)

    • Copy
    • List
    • Compress
    • Create
    • Extract
  18. Question ID 91

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

    • 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
  19. Question ID 92

    Which two commands do the same thing?

    (choose two)

    • 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
  20. Question ID 902

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

    • updatedb
    • search
    • locate
    • find

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