Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 1:

  John works as the Network Technician for Tech Perfect Inc. The company has a Linux- based network.

  John is a root user on the Red Hat operating system. John has two files named foo.txt and student.txt, which are too long. John wants to view the output of both the files on one screen at a time. Which of the following commands should John use to accomplish this task?

  A. touch foo.txt student.txt
  B. cat foo.txt | student.txt
  C. cp foo.txt student.txt
  D. cat foo.txt student.txt | less
  D. cat foo.txt student.txt | less

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  Explanation/Reference:

  The cat command concatenates both files foo.txt and student.txt together and | (pipe) will send the standard output of the cat command to the standard input of the less command, and this will show the output of both files on one screen at a time.

• Question 2:

  You work as a Network Administrator for Net Perfect Inc. The company has a Linux-based network.

  By using the VI utility, you have created a document that has 100 lines. You want to replace all the occurrences of "net" with "Net" in the first 50 lines of the document. Which of the following commands will you use?

  A. :1,$ s/net/Net/g
  B. :1,100 s/net/Net/g
  C. :1,50 s/net/Net/g
  D. :s/net/Net/g
  C. :1,50 s/net/Net/g

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  Explanation/Reference:

  In order to replace all the occurrences of "net" with "Net" in the first fifty lines of the file, you will have to execute the following command: :1,50 s/net/Net/g This command is issued in the command mode of the VI utility. 1,50 defines the initial

  and final line numbers of the current document where the command will execute. The s/ switch with the net/Net/g option will globally replace all the occurrences of "net" with "Net". Answer option A is incorrect. This command will replace "net"

  with "Net" all over the current document.

  Answer option B is incorrect. Since this command executes on the first 100 lines of a document, it will replace "net" with "Net" in all the 100 lines of the current document. Answer option D is incorrect. This command will replace "net" with "Net"

  in the current line of the current document.

• Question 3:

  Which of the following network diagnostic tools is NOT used in the Linux operating system?

  A. host
  B. dig
  C. ipconfig
  D. ping
  C. ipconfig

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  Explanation/Reference:

  The ipconfig network diagnostic tool is used in the Windows operating system to see IP addresses and MAC addresses, and other related information. It is not used in the Linux operating system. In the place of the ipconfig utility, ifconfig is

  used in Linux for performing the same task.

  Answer option D is incorrect. The ping utility is a network diagnostic tool that checks TCP/IP connectivity on any host. It is used in both Linux and Windows operating systems.

  What is the ping utility?

  The ping command-line utility is used to test connectivity with a host on a TCP/IP-based network.

  This is achieved by sending out a series of packets to a specified destination host. On receiving the packets, the destination host responds with a series of replies. These replies can be used to determine whether or not the network is working

  properly. Answer option A is incorrect. This is a network diagnostic tool in Linux that perform hostname to IP address translation and vice versa.

  Answer option B is incorrect. This is a network diagnostic tool in Linux which is used to perform hostname to IP address translations, and vice versa in greater detail.

• Question 4:

  Which of the following files is the default configuration file of XDM (X Window Display Manager)?

  A. /etc/X11/xdm/xdm-config
  B. $HOME/.Xauthority
  C. /usr/bin/xdm-config
  D. /usr/bin/xterm
  A. /etc/X11/xdm/xdm-config

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  Explanation/Reference:

  The /etc/X11/xdm/xdm-config file is the default configuration file of XDM. The X Window Display

  Manager (XDM) is the default display manager for the X Window System. XDM is distributed as part of XFree86 and is configured by a series of files located in /etc/X11/XDM. Some of the important files of XDM are given below in the list:

  Xaccess: It is used to control inbound requests from remote hosts. Xresources: This file holds configuration information for XDM resources and the graphical login screen. It can be edited to modify the appearance of the XDM login screen.

  Xservers:

  This file is used to associate the X display names with either the local X server software or a foreign display such as an X terminal.

  Xsession: This file contains the script XDM launches after a successful login. Xsetup_0: This file defines how XDM will open. It is a script started before the graphical login screen.

  It often includes commands to set colors, display graphics, or run other programs. This script is executed as root.

  XDM-config: This file is used to configure XDM configuration resources. Answer option B is incorrect. $HOME/.Xauthority is the user authorization file where XDM stores keys for clients to read.

  Answer option D is incorrect. The /usr/bin/xterm file is the default session program of XDM. Answer option C is incorrect. It is not a valid XDM configuration file.

• Question 5:

  You work as the Network Administrator for Perfect solutions Inc. The company has a Linux- based Network. You are a root user on the Red Hat operating system. You want to grant ownership of the file foofile to a user John. Which of the following commands should you use to accomplish this task?

  A. chown John foofile
  B. chmod John foofile
  C. chgrp foofile John
  D. chown foofile John
  A. chown John foofile

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  Explanation/Reference:

  This is the correct syntax for granting ownership of foofile to John.

  What is the chown command?

  The chown command is used to change the ownership of a file. Only root can change the ownership of a file. The chown command can be used with the -R option to recursively change the ownership of an entire directory tree.

  Syntax:

  chown [-R] newowner filename

  

  Answer option B is incorrect. The chmod command is used to change access mode for files and directories.

  Answer option D is incorrect. The syntax of this command is not correct. With chown, first write the name of the user whom you want to give ownership, then write the filename of the file whose ownership you want to change.

  Answer option C is incorrect. The chgrp command is used to change Group-ownership not file ownership.

• Question 6:

  You work as a Network Administrator for Tech World Inc. The company has a Linux-based network.

  The permissions on a file named Report are shown below:

  rwxr--r-

  You want to add a sticky bit to the file. Which of the following commands will you use?

  A. chmod 2744 report
  B. chmod 4744 report
  C. chmod 7744 report
  D. chmod 1744 report
  D. chmod 1744 report

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  Explanation/Reference:

  When 1 is added as a prefix to the permission set, it adds the sticky bit to the file permission.

  Therefore, in order to accomplish the task, you will have to run the following command:

  chmod 1744 report

  What is sticky bit?

  The sticky bit is a part of a permission set applied to files or folders. The sticky bit prevents others from deleting files from a folder. When the sticky bit is set on a directory, only the owner or root can unlink (delete) or rename the files in that

  directory. Without the sticky bit, anyone who is able to write to the directory can delete or rename the files. Answer option A is incorrect. This will set SGID to the file permission. Answer option B is incorrect. This will set SUID to the file

  permission. Answer option C is incorrect. Although this will add a sticky bit to the file permission, it will also set SGID and SUID to the file permission.

  What are SUID and SGID?

  Set user ID (SUID) and Set group ID (SGID) are used to set a file to run as something other than the standard. Normally, when a file is executed, it runs as the user who invokes it. Setting a file to SUID or SGID simply requires adding an extra

  digit to the permissions. Technically, if no digit is used, it assumes a leading 0.

  

• Question 7:

  John works as a Network Administrator for Perfect Solutions Inc. The company has a Linux-based network. John is working as a root user on the Linux operating system. You want to run two programs, foo and bar. You also want to ensure that bar is executed if and only if foo has executed successfully. Which of the following command sequences will John use to accomplish the task?

  A. foo andand bar;
  B. foo | bar;
  C. foo; bar;
  D. foo || bar;
  A. foo andand bar;

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  Explanation/Reference:

  According to the scenario, John will execute the foo andand bar; command. Because of the andand operator, bar will execute if and only if foo completes successfully. Answer option C is incorrect. The foo; bar; command sequence will run foo and bar

  in a sequential manner, but the successful completion of the first command does not matter. Answer option D is incorrect. The foo || bar; command sequence will run the bar if and only if foo fails to complete successfully.

  Answer option B is incorrect. In the foo | bar; command sequence, the output of the foo command will be the input for the bar command.

• Question 8:

  When you remove a user account from your Linux system, the files and directories of this user may still remain on the system. Which of the following commands can you use to remove all items from your Linux system?

  Each correct answer represents a complete solution. Choose two.

  A. userdel -r
  B. userdel -f
  C. userdel -h
  D. userdel -c
  A. userdel -r
  B. userdel -f

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  Explanation/Reference:

  When a user account is removed from a Linux system with the userdel command, the user account would get removed but some files and directories of that user may still remain on the system. To remove all items, the -r option is used with

  the userdel command. The -f option forcibly removes the user account even if the user is still logged in. It also forces userdel to remove the user's home directory or his mail spool even if another user uses the same home directory or if the

  mail spool is not owned by the specified user. Answer option C is incorrect. The -h option with the userdel command displays help messages and then exits.

  Answer option D is incorrect. This command is incorrect. The -c option is not used with the userdel command.

• Question 9:

  You run the wc -c file1.txt command. If this command displays any error message, you want to store the error message in the error.txt file. Which of the following commands will you use to accomplish the task?

  A. wc -c file1.txt >>error.txt
  B. wc -c file1.txt 1>error.txt
  C. wc -c file1.txt 2>error.txt
  D. wc -c file1.txt >error.txt
  C. wc -c file1.txt 2>error.txt

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  Explanation/Reference:

  According to the scenario, you will use the wc -c file1.txt 2>error.txt command to accomplish the task. The 2> operator is an error redirector, which, while running a command, redirects the error (if it exists) on the specified file. Answer options

  D and B are incorrect. The > or 1> redirector can be used to redirect the output of the wc -c file1.txt file to the error.txt file; however, you want to write the errors in the error.txt file, not the whole output.

  Answer option A is incorrect. The >> operator will redirect the output of the command in the same manner as the > or 1> operator. Although the >> operator will not overwrite the error.txt file, it will append the error.txt file.

• Question 10:

  John works as a Network Administrator for Perfect Solutions Inc. The company has a Linux-based network. John is working as a root user on the Linux operating system. He wants to change the modified date and time of the file private.txt to 11 Nov 2009 02:59:58 am. Which of the following commands will John use to accomplish his task?

  Each correct answer represents a complete solution. Choose all that apply.

  A. touch -t 200911110259.58 private.txt
  B. rm private.txt #11 Nov 2009 02:59:58 am
  C. touch private.txt #11 Nov 2009 02:59:58 am
  D. touch -d "11 Nov 2009 02:59:58 am" private.txt
  A. touch -t 200911110259.58 private.txt
  D. touch -d "11 Nov 2009 02:59:58 am" private.txt

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  Explanation/Reference:

  According to the scenario, John wants to change the modified date and time of the file private.txt to a desired date and time. For this, he can use either the touch -t or touch -d command. The difference between these two commands is that the touch -d command is more flexible, while the touch -t command takes the date and time in the format MMDDhhmm.ss.