Linux Essentials – Chapter 09 Exam Test Online 2019

1. Question

1 points

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. Question

1 points

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. Question

1 points

Which are appropriate editors for writing shell scripts? (choose two)

/bin/bash
vi
LibreOffice Writer
Firefox
nano

4. Question

1 points

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. Question

1 points

What does this shell script do? FOO=/tmp/foo if [ ! –d $FOO ]; then mkdir $FOO fi

Creates /tmp/foo if it does not exist
Outputs a message to the screen
Creates /tmp/foo and raises an error if there is a problem
Makes the /tmp/foo directory if a file by that name exists
Nothing, since there is a problem with the conditions in the if statement

6. Question

1 points

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. Question

1 points

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. Question

1 points

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. Question

1 points

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. Question

1 points

What is the correct way to save the current directory to a variable?

A=`pwd`
A=pwd
A=cwd
pwd $A
pwd | $A

11. Question

1 points

Which shell command accepts input from the user’s keyboard?

echo
$1
read
input
gets

12. Question

1 points

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. Question

1 points

How would you finish your script with an exit code of 42?

return 42
$?=42
CODE=42
exit 42
break 42

14. Question

1 points

The if command looks for what exit code to consider a condition to be true?

10
255
0
1
8

15. Question

1 points

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. Question

1 points

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. Question

1 points

A conditional that lets you make multiple comparisons with a pattern is called:

case
fanout
if
test
branch

18. Question

1 points

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. Question

1 points

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 –d /tmp/foo –o $USERS –gt 5
test /tmp/foo || $USERS > 5
test /tmp/foo –d –o $USERS -gt 5
test –f /tmp/foo –o $USERS –ge 5

Linux Essentials – Chapter 09 Exam Test Online 2019

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