Introduction to Linux II

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.

  • ENV
  • 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

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