Linux Essentials – Chapter 07 Exam Answers 2019 + PDF file

1. 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. 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. 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. 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. 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. 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. Which flag would you pass to tar in order to have it make a new archive?
   • –t
   • -c *
   • –j
   • -x
   • –n
8. 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. 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. 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. 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. 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. 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. 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. 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. Which of the following commands can be used to compress a file? (choose three)
    • bunzip2
    • bzip2*
    • gzip*
    • cat
    • zip*
17. The three main modes of tar are: (choose three)
    • Copy
    • List*
    • Compress
    • Create*
    • Extract*
18. 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. 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. 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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