Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 71:

  You work as the Network technician for McNeil Inc. The company has a Linux-based Network. You are working on the Red Hat operating system. You want to remove some write protected files and directories. Which of the following commands should you use to accomplish this task?

  A. rm -rf
  B. rm -f
  C. rmdir
  D. rm
  A. rm -rf

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  Explanation/Reference:

  The rm -rf commarecursively removes directories and its contents, ignoring warnings about removing write-protected files and directories.

  Answer option B is incorrect. rm -f removes only files forcibly not a directory. To remove a directory and its contents forcibly, use -r in combination with -f with the rm command. Answer option C is incorrect. The rmdir command is use to

  remove an empty directory. Answer option D is incorrect. rm with no arguments deletes files.

• Question 72:

  Which of the following commands list the configured printers in a Linux network? Each correct answer represents a complete solution. Choose all that apply.

  A. lpstat -a
  B. lpstat -l
  C. lpstat -o
  D. lpstat -r
  A. lpstat -a
  B. lpstat -l

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  Explanation/Reference:

  The lpstat -a, lpstat -l commands list the configured printer in the network. Answer option D is incorrect. The lpstat -r command shows whether or not the CUPS server is running. Answer option C is incorrect. The lpstat -o command shows the jobs queue on the specified destinations.

• Question 73:

  Which of the following commands is used to create a partition on a new hard disk of a Linux computer?

  A. fdisk
  B. crpar
  C. mount
  D. fsck
  A. fdisk

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  Explanation/Reference:

  The fdisk command is a menu-based command available with Linux for hard disk configuration. This command can perform the following tasks:

  Delete a partition on a hard disk.

  Create a partition on a hard disk.

  Change the partition type.

  Display the partition table.

  Note: The sfdisk command-line utility is an alternative to the fdisk command. Answer option C is incorrect. In Linux, the mount command is used to mount and display disks, partitions, and file systems. Mounting refers to the process in which

  the operating system prepares the media to be read.

  Anwer option D is incorrect. The File System Check (fsck) command is used to scan all disks and partitions, and it repairs them if required. The fsck command should be run only on an unmounted file system. Note: The function of the fsck

  command is similar to that of the Window's scandisk utility. Answer option B is incorrect. There is no such command as crpar in Linux.

• Question 74:

  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 view all files with a size of over 50 megabytes on your system. Which of the following commands should you use to accomplish the task?

  A. find -size +50M
  B. find -size -50M
  C. find -size 50M
  D. find size +50M
  A. find -size +50M

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  Explanation/Reference:

  This command will search for files with a size of over 50 megabytes. The -size option tells find to search files according to the size of files, and +50M will tell the find command to search files over 50 megabytes. Answer option C is incorrect.

  This command will search for files with a size of exactly 50 megabytes.

  Answer option B is incorrect. This command will search for files with a size of less than 50 megabytes.

  Answer option D is incorrect. - must be prefixed with size, otherwise shell will not recognize this command, and display an error message.

• Question 75:

  Which of the following information does the /etc/passwd file contain? Each correct answer represents a complete solution. Choose all that apply.

  A. Numerical group ID
  B. User name
  C. Shadow password
  D. Numerical user ID
  E. Reserved gecos ID
  F. User's home directory
  A. Numerical group ID
  B. User name
  D. Numerical user ID
  E. Reserved gecos ID
  F. User's home directory

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  Explanation/Reference:

  All these information are stored in the /etc/passwd file.

  What is the /etc/passwd file?

  In Linux operating systems, the /etc/passwd file lists information about each of the users that may login to the system. The file is so named because originally it also contained the data used to verify passwords. However, on

  modern Unix systems, the security-sensitive password information is instead often stored in a different file using shadow passwords.

  The /etc/passwd file typically has world-readable permissions, though it may only be edited by the

  superuser or by using a few special purpose commands. The first field is the user name. Each record in the file must have a unique user name field. The second field stores information used to confirm a user's password; however, in most

  modern uses, this field is usually set to "x" (or some other indicator) with the actual password information being stored in a separate shadow password file. The third field is the user identifier, the number that the operating system uses for

  internal purposes. It does not have to be unique.

  The fourth field is the group identifier. This number identifies the primary group of the user; all files that are created by this user will initially belong to this group. Reserved gecos ID (Typically, this is a set of comma-separated values including

  the user's full name

  and contact details).

  The sixth field is the path to the user's home directory. The seventh field is the shell program that is started every time the user logs into the system.

  Answer option C is incorrect. The shadow password is stored in the /etc/shadow file.

  What is /etc/shadow file?

  The /etc/shadow file stores the account information in the following format:

  

• Question 76:

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

  You are working as a root user on the Linux operating system. You want to create an alias such that when you type c, the system should run the clear command to clear the screen. Which of the following tools should you use to accomplish the task?

  A. alias clear
  B. alias clear= c
  C. alias c
  D. alias c= 'clear'
  D. alias c= 'clear'

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  Explanation/Reference:

  When a user types alias c= 'clear' on the command prompt and presses Enter this will create an alias for the clear command. After creating the alias whenever a user wants to clear the screen, he just needs to type c and then press Enter.

  This action will clear the screen. This alias will be lost if a user logs out and logs in again.

  What is the alias command?

  The alias command is a shortcut name for longer commands. If a command is run often, but it takes a considerable amount of time in typing that command, the time can be reduced by using the alias command.

  For example: # alias list= 'ls-la'

  This will create an alias called list, which will use the ls command to print a long-style listing of all files in the current directory (the -l gives a long-style list, and the -a shows all files - including hidden files).

  Answer options B, C, and A are incorrect. These are incorrect commands and will show error messages on the command prompt.

• Question 77:

  You work as a Network Administrator for Perfect World Inc. The company has a Linux- based network. You have configured a Linux server to connect to the Internet. Before connecting it to the Internet, you want to check all the files on which SUID has been set. Which of the following commands will you choose to list all such programs?

  A. find /-perm -2000
  B. ls -l
  C. ls -suid
  D. find /-perm -4000
  D. find /-perm -4000

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  Explanation/Reference:

  In order to accomplish the task, you will have to execute the following command: find /- perm -4000

  This command will search the current directory and its sub-directories for all the files on which SUID has been set.

  Answer options C and B are incorrect. The ls command is used to list all files in the current directory and its subdirectory.

  Answer option A is incorrect. This will find all the files on which SGID is set.

• Question 78:

  You work as a Network Administrator for Perfect Solutions Inc. The company has a Linux- based network. Rick, a Sales Manager, wants to combine the contents of the Sale1.txt and Sale2.txt files to a new file named FinSale.txt.

  Which of the following commands will he use to accomplish the task?

  A. ls Sale1.txt Sale2.txt < FinSale.txt
  B. cat Sale1.txt Sale2.txt < FinSale.txt
  C. ls Sale1.txt Sale2.txt > FinSale.txt
  D. cat Sale1.txt Sale2.txt > FinSale.txt
  D. cat Sale1.txt Sale2.txt > FinSale.txt

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  Explanation/Reference:

  The concatenate (cat) command is used to display or print the contents of a file.

  Syntax:

  cat filename

  For example, the following command will display the contents of the /var/log/dmesg file:

  cat /var/log/dmesg

  Note: The more command is used in conjunction with the cat command to prevent scrolling of the screen while displaying the contents of a file.

• Question 79:

  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 break a dat a.txt file, 200MB in size, into two files in which the size of the first file named data.txt.aa should be150MB and that of the second file named data.txt.ab should be 50MB. To accomplish his task and to further delete the data.txt file, he enters the following command: split --verbose -b 150m data.txt data.txt. ; rm -vf data.txt

  Which of the following commands can John use to join the splitted files into a new data.txt file?

  A. vi data.txt.*
  B. less data.txt.* > data.txt
  C. cat data.txt.* > data.txt
  D. vi data.txt.* > data.txt
  C. cat data.txt.* > data.txt

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  Explanation/Reference:

  The cat data.txt.* command will display both the splitted files, and the > command will redirect the output into a new data.txt file.

  What is the cat command?

  The concatenate (cat) command is used to display or print the contents of a file.

  Syntax: cat filename

  For example, the following command will display the contents of the /var/log/dmesg file: cat /var/log/dmesg

  Note: The more command is used in conjunction with the cat command to prevent scrolling of the screen while displaying the contents of a file.

  What is > command?

  The > command is used for storing the output generated by different commands. It creates a file specified to store the output. If the specified file already exists, it overwrites that file. Answer option A is incorrect. This command will open a new

  file data.txt.* into the vi editor. Answer option D is incorrect. This command will give the vi editor a warning "output is not to a terminal" since the vi terminal cannot be redirected into the data.txt file. Answer option B is incorrect. The less

  command displays only the first file data.txt.aa, and the > command redirects the output into the data.txt file. Hence, John will not get the desired output using this command.

• Question 80:

  Which of the following commands are used to start and stop a service, and to ensure persistence across reboots? Each correct answer represents a complete solution. Choose all that apply.

  A. chkconfig
  B. tar
  C. service
  D. yum
  A. chkconfig
  C. service

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  Explanation/Reference:

  The service and chkconfig commands are used to start and stop a service, and to ensure persistence across reboots. The service command is used to abstract the management of services provided by the system. It can be used to start and stop services, as well as to determine the status of services. To execute a given command for a given service, it uses the start, stop, restart, and reload arguments. Some important options used with the service command are as follows:

  

  The chkconfig tool is used to update and query runlevel information for system services. Answer option D is incorrect. The yum command automatically attempts to check all configured repositories to resolve all package dependencies during an installation/upgrade. Answer option B is incorrect. The tape archive (tar) command combines a large number of files into a single file for archival purposes.