Linux Essentials – Chapter 09 Exam Answers 2019 + PDF file

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  1. The echo command:
    • Is used for variable assignment
    • Duplicates the input stream to the output stream
    • Is used to output text to the console*
    • Tests a variable for duplication
    • Copies variables from one to another
  2. A file begins with #!/bin/csh. This means:
    • Nothing, this is a comment
    • C Shell compatibility mode is enabled
    • The operator should not be using /bin/csh
    • Running the script will invoke /bin/csh to interpret the rest of the file*
    • This is a Perl script
  3. Which are appropriate editors for writing shell scripts? (choose two)
    • /bin/bash
    • vi*
    • LibreOffice Writer
    • Firefox
    • nano*
  4. Most of nano’s commands take the form of:
    • Control and another character*
    • Alt and another character
    • Mouse clicks
    • The F1 through F12 function keys
    • Escape followed by another character
  5. What does this shell script do?
    FOO=/tmp/foo
    if [ ! –d $FOO ]; then
         mkdir $FOO
    fi

    • Creates /tmp/foo if it does not exist*
    • Makes the /tmp/foo directory if a file by that name exists
    • Outputs a message to the screen
    • Creates /tmp/foo and raises an error if there is a problem
    • Nothing, since there is a problem with the conditions in the if statement
  6. Which of the following are correct about for and while loops? (choose two)
    • for loops operate over a fixed list of items*
    • while loops operate over a fix list of items
    • for loops have a test each cycle to determine if it should run again
    • while loops have a test each cycle to determine if it should run again*
    • for loops require a variable over which to iterate
  7. Given the following part of a script:
    if [ -f $1 ]; then
    echo “I am here”
    fi
    What is the meaning of $1?

    • It is a special variable that indicates the exit code of the command before it
    • It is the first argument passed to the script*
    • It is a file called $1
    • It is a parameter to –f, indicating the size of the file
    • It is a list of files that gets interpolated
  8. Given the following script that is run through ./test.sh hello goodbye:
    if [ -f $2 ]; then
        echo “I am here”
    fi

    • When will “I am here” be printed?
    • If there are two files in the current directory
    • The script will always print “I am here”
    • Never
    • If a file called “hello” exists in the current directory
    • If a file called “goodbye” exists in the current directory*
  9. What is the correct way to assign the word “Hello” to a variable?
    • $A=”Hello”
    • echo “Hello” > A
    • A=”Hello” *
    • echo $A “Hello”
    • A = “Hello”
  10. What is the correct way to save the current directory to a variable?
    • A=`pwd` *
    • A=pwd
    • A=cwd
    • pwd $A
    • pwd | $A
  11. Which shell command accepts input from the user’s keyboard?
    • echo
    • $1
    • read*
    • input
    • gets
  12. What information is held inside $? ?
    • The current process id
    • The number of arguments passed to the script
    • The current user ID
    • The previous command’s exit code*
    • The name of the command run
  13. How would you finish your script with an exit code of 42?
    • return 42
    • $?=42
    • CODE=42
    • exit 42*
    • break 42
  14. The if command looks for what exit code to consider a condition to be true?
    • 10
    • 255
    • 0 *
    • 1
    • 8
  15. The number of users logged in is in a variable called USERS. How would you test to see if 5 users are logged in?
    • test –f USERS=5
    • test $USERS = 5
    • test $USERS,5
    • test $USERS –eq 5 *
    • test $USERS –a 5
  16. Given the following script:
    while [ ! –f /tmp/foo ]; do
    echo –n “.”
    process_data > /tmp/foo
    done
    Which of the following are true? (choose two)

    • If a file called /tmp/foo exists, process_data won’t be run*
    • The screen will fill with dots.
    • /tmp/foo will be removed if it exists
    • process_data will never be run
    • process_data will be called at most once*
  17. A conditional that lets you make multiple comparisons with a pattern is called:
    • case*
    • fanout
    • if
    • test
    • branch
  18. What is the meaning of $(( $i + 1)) ?
    • 1 will be added to the i variable*
    • This will return the value of the next argument to the script
    • This runs the command stored in variable i
    • If i is 0, the loop will stop
    • This will return the value of the first argument to the script
  19. How would you write a test that says “if /tmp/foo is a directory or USERS is greater than 5”?
    • test –d /tmp/foo | $USERS > 5
    • test –f /tmp/foo –o $USERS –ge 5
    • test –d /tmp/foo –o $USERS –gt 5 *
    • test /tmp/foo || $USERS > 5
    • test /tmp/foo –d –o $USERS -gt 5

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