Introduction to Linux II Chapter 2 Exam Answer 2016

1. Which of the following steps is NOT performed while creating a shell script?

• Create a file with commands
• Make the file executable
• Login as root on the server console
• Put #!/bin/bash as the first line

2. The first line in a shell script reads:. #!/bin/bash. What does it signify?

• It is a comment
• The executable (shell) to use to run the script
• Name of the editor used to create the file
• The script requires root login

3. The command bash script_file can be used to directly execute a shell script.. True or False?

• True
• False

4. Which of the following is placed before a script name to execute it from the current directory?

• #!
• !!
• ./
• //

5. Instead of specifying the current directory, it is better to place the script in a location that is included in the __________ variable.

• SCRIPTS
• ENV
• GLOBAL
• PATH

6. An ideal place for a regular user (not a super user), to place their shell scripts would be:

• /sbin
• /home/john/bin
• /usr/local/sbin
• /bin

7. Use of SETUID permission on scripts is the best way to specify permissions.. True or False?

• True
• False

8. A user has written a few scripts for private use. Which of the following commands should be used so that no one else has execute permission?

• chmod u-rx script_file
• chmod u+x script_file
• chmod -R 755 script_file
• chmod a+x script_file

9. Which of the following commands will produce the same result as start=`date`?

• start=date
• start=%date%
• start=$(date)
• start=(date)

10. The __________ statement can be used to gather information from the user running the script.

• read
• for
• seq
• if

11. The command read –p will capture the current position of the mouse pointer.. True or False?

• True
• False

12. Conditional statements CANNOT be used to determine which of the following?

• System runlevel
• If the file exists
• If two strings match or not
• If two numeric values match

13. When will the condition test –n STRING be true?

• If the length of STRING is nonzero
• If the length of STRING is zero
• Never
• Always

14. In shell scripts, the conditional statement if must always end with:

• then
• elif
• fi
• False condition

15. The return status from a command is 1. What does this indicate?

• Calculation done by the command yields the result 1
• Command is still running in the background
• Command executed successfully
• Command did not execute successfully

16. A user jamie already exists in the system. The command grep jamie /etc/passwd displays one user record. Running the echo $? command immediately after the grep command would result in what output?

• 5
• 1
• 2
• 0

17. Which of the following will NOT handle bad user input properly:

• Checking the value of the $? variable using an if statement
• Checking the validity of user input before passing it on to the command
• Checking the return value of a command directly in the conditional part of the if statement
• Checking the command’s Standard Output

18. A user wants an email sent when his shell script is executed successfully. Which of the following commands in the script can do this?

• mail root
• echo $mail
• mail brad
• cron job will send an email by default

19. The __________ statement is most useful in performing an operation on multiple items.

• read
• for
• test
• many

20. What will the following statement do?. for name in `cat /root/users`

• Get into an infinite loop
• Assign to the name variable each value in the specified file
• Run for two values cat and /root/users
• Report an error

21. The output of the command seq 10 10 30 will be:

• 50
• 10 10 30
• 10 20 30
• 3

22. The ___________ command is used to print a sequence of numbers.

• seq
• series
• num
• list

23. The statement if [ -d file ] will be true, if the file:

• Is executable
• Exists
• Is writable
• Is a directory

24. Which of the following file test statement conditions is NOTcorrect?

• -d filename tests if the file is in the current directory
• -x filename tests a file to determine if it is executable
• -w filename tests a file to determine if it is writable
• -e filename tests if the file exist

25. A user wants to execute a script called test1_script. What type of permission does she need on the test1_script file?

• Read and execute
• Read and write
• Read only
• Write only

26. Command substitution can be used to insert the output of a command as another command’s argument.. True or False?

• True
• False