Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 101:

  John works as a Network Administrator for Perfect Solutions Inc. The company has a Linux-based network. John is working as the root user on the Linux operating system. He wants to copy all files with the .dat extension from /home/john to / home/maria while preserving the file attributes, such as timestamps, mode, and ownership. Which of the following commands will he use to accomplish the task?

  A. cp -p /home/john/*.dat /home/maria
  B. cp -R /home/john/*.dat /home/maria
  C. cp -l /home/maria/*.dat /home/john
  D. cp -l /home/john/*.dat /home/maria
  A. cp -p /home/john/*.dat /home/maria

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  Explanation/Reference:

  According to the scenario, since John wants to copy all files with the .dat extension from /home/john to /home/maria while preserving the file attributes such as timestamps, mode, and ownership, he will use the cp -p /home/john/*.dat /home/maria command to accomplish the task. The cp -p command copies files from source to destination while preserving the file attributes, such as timestamps, mode, and ownership. Answer option B is incorrect. The cp -R /home/john/*.dat /home/maria command will recursively copy all .dat files from source to destination; however, it will not preserve the file attributes. Answer option D is incorrect. The cp -l /home/john/*.dat /home/maria command will link all .dat files from /home/john to /home/maria instead of copying them. Answer option C is incorrect. The cp -l /home/maria/*.dat /home/john command will link all .dat files from /home/maria to /home/john instead of copying them.

• Question 102:

  You want to run a program in future. However, you do not want to run it more than once. Which of the following commands will you use to accomplish the task?

  A. rsync
  B. at
  C. crontab
  D. sync
  B. at

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  Explanation/Reference:

  In order to accomplish the task, you will use the at command. The at command is used to set a specific command or batch file to execute at a certain time.

  Syntax:

  at [option] schedule time

  Several options are used with the at command. Following is a list of some important options:

  

  The atd daemon monitors the queue of the at commands and executes them at a specified time.

  Example:

  The following command will create a list of jobs to be executed at 8:00 AM on 22nd August 2004.

  at 08:00 22.08.2004

  at> ls

  at> pwd

  +

  The + key combination is used to end the list of commands. The jobs can be removed from an at queue by using the atrm command. Note: The at command cannot schedule recurring jobs. Answer option C is incorrect. You will not

  run the crontab command, since it runs a program repeatedly. The crontab command is used to view and edit the crontab files, which are used to organize the cron facility. Each user has access to the cron facility through a crontab file. Some

  of the frequently used crontab command options are as follows:

  

  Answer option A is incorrect. In computing, rsync is a software application for Unix systems. It synchronizes files and directories from one location to another while minimizing data transfer using delta encoding. It can copy or display directory

  contents and copy files, optionally using compression and recursion.

  In daemon mode, rsync listens to the default TCP port of 873, serving files in the native rsync protocol or via a remote shell such as RSH or SSH. In the latter case, the rsync client executable must be installed on both the local and remote

  hosts.

  Answer option D is incorrect. The sync command is used to flush filesystem buffers. It ensures that all disk writes have been completed before the processor is halted or rebooted. Generally, it is preferable to use reboot or halt to shut down a

  system, as they may perform additional actions such as resynchronizing the hardware clock and flushing internal caches before performing a final sync.

• Question 103:

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

  There are six files in a directory on your laptop. You want to find out the file types of all the files at a time. Which of the following commands will you use?

  A. fsck
  B. file
  C. mount
  D. init
  B. file

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  Explanation/Reference:

  You can use the file command to display the file types of all the files in a directory at a time. In order to accomplish the task, you will have to issue the following command:

  file *

  What is the file command?

  The file command is used to analyze the files specified in the argument.

  Syntax:

  file [] [] ... By providing the name of a file as an argument, the file command analyzes the file. The file command supports multiple arguments. The asterix (*) metacharacter can also be used with the file

  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.

  Answer option A 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.

  Answer option D is incorrect. The init command is used to switch a Linux computer to different run levels.

• Question 104:

  You want to temporarily change your primary group to another group of which you are a member. In this process, a new shell will be created, and when you exit the shell, your previous group will be reinstated. Which of the following commands will you use to accomplish this task?

  A. chmod
  B. newgrp
  C. chgrp
  D. chown
  B. newgrp

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  Explanation/Reference:

  According to the scenario, you will use newgrp command to accomplish the task. The newgrp command is used to temporarily change the primary group of a user into another group of which that user is a member. In this step, a new shell will

  be created, and when that user will exit from the shell, his previous group will be reinstated. If no group is specified, the GID is changed to the login GID.

  Answer option C is incorrect. John will not use the chgrp command to accomplish his task. The chgrp (from change group) command is used by unprivileged users to change the group associated with a file. Unlike the chown command, chgrp

  allows regular users to change groups, but only to one of which they are a member. The general syntax of the chgrp command is as follows:

  chgrp group target1 [target2 ..]

  The group parameter indicates the new group with which the targets should be associated. The target1 parameter indicates the files or directories for which the change should be made.

  The target2 parameter indicates the optional additional files or directories for which the change should be made.

  For example:

  

  The above command changes the group associated with ttt to 'system', provided the executing user is a member of that group.

  Answer option D is incorrect. John will not use the chown command to accomplish his task. The chown command is used to change the user and/or group ownership of each given file as specified by the first non-option argument as follows: if

  only a user name (or numeric user ID) is given, that user is made the owner of each given file, and the file's group is not changed.

  If the user name is followed by a colon and a group name (or numeric group ID), with no spaces between them, the group ownership of the files is changed as well. The syntax of the chown command is as follows: chown [-R [ -H | -L | -P ]] [ -h

  ] owner[:group] file ...

  

  Answer option A is incorrect.

  The chmod command is used to change the access mode of a file. The syntax of the command is: chmod who=permissions filename

  Here, "who" refers to the owner of the file, group members, or other users, and permissions refers to "rwx".

  For example, chmod 755 File.txt will give all access permissions to the owner and the read and execute permissions to the group members and other users.

• Question 105:

  Which of the following is a utility that can function as an independent spell checker?

  A. spell
  B. nice
  C. aspell
  D. inspell
  C. aspell

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  Explanation/Reference:

  aspell is a utility that can function as an ispell -a replacement, as an independent spell checker, as a test utility to test out Aspell features, and as a utility for managing dictionaries.

  Syntax:

  aspell [options]

  Some important options used with aspell are as follows:

  

  Answer option B is incorrect. The nice command is used to change the priority of a process in the kernel's scheduler. A niceness of -20 is the highest priority and 19 is the lowest priority. The default niceness for processes is inherited from its

  parent process, usually 0. For example, when specifying a very low priority, the following command can be entered:

  nice -n 19 cc -c *.c and

  The above command runs the cc command in the background at a lower priority than the default priority set by the nice command.

  Answer options D and A are incorrect. There are no such spell checkers as inspell and spell.

• Question 106:

  Fill in the blank with the required permission to complete the statement below. In order to make a script executable in a Linux computer, you must assign the___________ permission to the script file.

  execute

  Explanation/Reference:

  In order to run the script, you are required to add the execute permission to the script file. The permission can be assigned through the chmod command.

  What is the chmod command?

  The chmod command is used to change file access permissions in Linux.

  Syntax:

  chmod [option] [mode]

  Option: The following is a list of some important options that can be provided with the command:

  

  Mode: Mode is written in the following format:

  [ugoa] [+-=] [rwxXstugo]

  The combination of ugoa specifies the users for whom the file access permissions will be changed. In ugoa, u is for the user who owns the file, g is for other users in the file group, o is for other users not in the file group, and a is for all users.

  The operator + adds the specified permissions to the existing permissions of each file. The

  - operator removes, and the = character specifies that the specified permissions are the only permissions for that file.

  The combination of rwxXstugo is permission type. In rwxXstugo, r is for read, w is for write, x is for execute, X is to execute only if the file is a directory or already has execute permission for some user, s is to set user or group ID on execution,

  t is to save program text on swap device, u are the permissions that the user who owns the file currently has for it, g are the permissions that other users in the file group have for the file, and o are the permissions that other users not in the file

  group have for the file.

• Question 107:

  You work as a Network Administrator for Perfect Solutions Inc. The company has a Linux- based network. You want to modify a configuration file in a Linux server. Which of the following utilities will you use to accomplish the task?

  A. VI
  B. NMAP
  C. MS Word
  D. GZIP
  A. VI

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  Explanation/Reference:

  The VI is a visual interactive text editor that allows a user to create, modify, and store files on a Linux computer. It works in the following modes:

  Command: This is the default mode of the command. Various commands can be used in this mode to manipulate the opened text.

  Input: In this mode, a user can insert text directly in the text screen area. Answer option D is incorrect. The GNU zip (GZIP) utility is a compression utility that is used to compress files for saving space. It creates files with the .gz extension. It

  can also compress tar files. In order to unzip files with the .gz extension, the GUNZIP command is used.

  Answer option B is incorrect. The nmap utility, also commonly known as port scanner, is used to view the open ports on a Linux computer. It is used by administrators to determine which services are available for external users. This utility

  helps administrators in deciding whether to disable the services that are not being used in order to minimize any security risk.

  Answer option C is incorrect. MS Word is a Windows-based utility. Hence, it cannot be used in Linux.

• Question 108:

  You work as the Network Administrator for Tech Perfect Inc. The company has a Linux- based Network. You are working as a root user on the Red Hat operating system. You want to find out the disk space usage of a remote host named

  York. For this, you have to remotely login to York and run the command to determine how much disk space has been used on per filesystem basis.

  Which of the following command syntaxes should you use to securely access the data from the remote host?

  A. ssh 'df -h'
  B. York ssh 'df -h'
  C. ssh York 'df -h'
  D. ssh 'df -h' York
  C. ssh York 'df -h'

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  Explanation/Reference:

  You will use the ssh command to remotely login to the host York and then remotely execute the command 'df -h' to check the disk space usage on the remote system.

• Question 109:

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

  You run the following command on the terminal: find -name "*.conf" -exec cp {} {} .orig \ ;

  What will this command do?

  A. It will extract the content of configuration files from the current directory.
  B. It will search configuration files from the current directory and a .orig extension.
  C. It will back up configuration files from the current directory and a .orig extension.
  D. It will fix other-writable files in your home directory.
  C. It will back up configuration files from the current directory and a .orig extension.

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  Explanation/Reference:

  When you will execute find -name "*.conf" -exec cp {} {} .orig \ ; command on the terminal, it will back up configuration files from the current directory and a .orig extension.

  What is the find command?

  The find command can perform a search based on a variety of search limitations. It searches through one or more directory tree(s) of a filesystem, locating files based on some user-specified criteria. By default, find returns all files in the

  current working directory. Further, find allows a user to specify an action to be taken on each matched file. Thus, it is an extremely powerful command for applying actions to many files. The find command can be used with a wild card (*), but it

  works best when we know the name of the file or directory we are looking for.

  The find command can search your system for files that comply with certain numeric criteria, such as the size of the file (- size), the number of links to the file (-links), the date of the last change to the files data (-mtime), or the date of the last

  time the file was read (- atime). All these criteria accept a numeric value. When a numeric value is provided to find, it looks for an exact match, more than the number, or less than the number. Answer options B and A are incorrect. These

  options are invalid. Answer option D is incorrect. To fix other-writable files in your home directory, you will run find ~ - perm -002 -exec chmod o-w {} \;.

• Question 110:

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

  You are a root user on the Red Hat operating system. You want view all files on the system that have the .xml filename extension. Which of the following commands should you use to accomplish the task?

  A. locate .xml
  B. locate -name /.xml
  C. locate "*.xml"
  D. cat .xml
  C. locate "*.xml"

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  Explanation/Reference:

  The locate command queries a database for all pathnames that match the specified pattern. The specificity of locate can be increased by using it together with wildcards or other regular expressions. This command uses the star wildcard to

  display all files on the system that have the .xml filename extension.

  What is a regular expression?

  A regular expression is a way of describing a string of text using metacharacters or wildcard symbols.

  For example, "*.xml" is a regular expression that refers to all files having the extension .xml.

  What is a wildcard?

  The specificity of LOCATE can be increased by using it together with wildcards or other regular expressions. Wildcards are characters that can be used to substitute for any other character or characters. For example, the star character (*) is a

  wildcard that can represent any single character or any string containing any number of characters. Answer option A is incorrect. This is an incorrect syntax and an error messages will be displayed.

  Answer option D is incorrect. The cat command displays the content of the specified file. Answer option B is incorrect. This is an incorrect command, when you type this command an error message will be displayed.