Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 121:

  Which of the following text editing tools can be used to edit text files without having to open them?

  A. less
  B. sed
  C. vi
  D. more
  B. sed

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  Explanation/Reference:

  The Unix utility sed (stream editor) is a text editing tool that can be used to edit text files without having to open them. This utility parses text files and implements a programming language which can apply textual transformations to such files.

  It reads input files line by line

  (sequentially), applying the operation which has been specified via the command line (or a sed script), and then outputs the line.

  Answer option D is incorrect. The more command is used to view (but not modify) the contents of a text file on the terminal screen at a time. The syntax of the more command is as follows: more [options] file_name Where,

  

  Answer option A is incorrect. The less command is used to view (but not change) the contents of a text file, one screen at a time. It is similar to the more command. However, it has the extended capability of allowing both forward and backward navigation through the file. Unlike most Unix text editors/viewers, less does not need to read the entire file before starting; therefore, it has faster load times with large files. The command syntax of the less command is as follows: less [options] file_name Where,

  

  Answer option C is incorrect. The vi editor is an interactive, cryptic, and screen-based text editor used to create and edit a file. It operates in either Input mode or Command mode. In Input mode, the vi editor accepts a keystroke as text and displays it on the screen, whereas in Command mode, it interprets keystrokes as commands. As the vi editor is case sensitive, it interprets the same character or characters as different commands, depending upon whether the user enters a lowercase or uppercase character. When a user starts a new session with vi, he must put the editor in Input mode by pressing the "I" key. If he is not able to see the entered text on the vi editor's screen, it means that he has not put the editor in Insert mode. The user must change the editor to Input mode before entering any text so that he can see the text he has entered.

• Question 122:

  Which of the following cp command parameters copies only when the source file is newer than the destination file or when the destination file is missing?

  A. -u
  B. -l
  C. -p
  D. -s
  A. -u

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  Explanation/Reference:

  The cp -u command copies only when the source file is newer than the destination file or when the destination file is missing.

  Answer option C is incorrect. The cp -p command copies the files from source to destination with preserving file attributes, such as timestamps, mode, and ownership. Answer option B is incorrect. The cp -l command links files from source to

  destination instead of copying.

  Answer option D is incorrect. The cp -s command makes symbolic links instead of copying.

• Question 123:

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

  You have created a folder named Report.

  You have made David the owner of the folder. The members of a group named JAdmin can access the folder and have Read, Write, and

  Execute permissions. No other user can access the folder. You want to ensure that the members of

  the JAdmin group do not have Write permission on the folder. Also, you want other users to have Read permission on the Report folder.

  Whizh of the following commands will you use to accomplish the task?

  A. chmod 777 report
  B. chmod 754 report
  C. chown david.jadmin report
  D. chmod 555 report
  B. chmod 754 report

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  Explanation/Reference:

  The chmod command is used to change or edit file/folder permissions in Linux. In order to accomplish the task, you will have to run the following command:

  chmod 754 report

  This will provide Read, Write, and Execute permissions to the owner (in this case, David), Read and

  Execute permissions to the members of the JAdmin group, and only Read permission to other users.

  Answer option D is incorrect. This will provide Read, Write, and Execute permissions to David, to the members of the JAdmin group, and to other users. Answer option A is incorrect. This will provide Read and Execute permissions to David, to

  the members of the JAdmin group, and to other users. Answer option C is incorrect. The chown command is used to change the ownership on files or folders.

• Question 124:

  Which of the following statements are true about file permissions?

  Each correct answer represents a complete solution. Choose three.

  A. The execute permission means that the file can be run if it is a program or script.
  B. The write permission means that the file can be edited and saved.
  C. The read permission means that only the file name can be read not the contents of the file.
  D. The read permission means that the contents of the file can be seen with a command such as cat or less.
  A. The execute permission means that the file can be run if it is a program or script.
  B. The write permission means that the file can be edited and saved.
  D. The read permission means that the contents of the file can be seen with a command such as cat or less.

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  Explanation/Reference:

  The read permission allows a user to read a file. The content of a file can be seen by cat or less commands. When the read permission is set for a directory, it allows a user to read the names of files in the directory (but not to find out any

  other information about them including file type, ownership, size, etc.).

  The write permission means that a user is permitted to write in a file. So, if a file has the write permission it can be edited and saved.

  The execute permission grants a user the ability to execute a file. This permission must be set for executable binaries.

  Answer option C is incorrect. If a file has the read permission, its contents can also be read not only the file name.

• Question 125:

  You work as a Network Administrator for company.com Inc. The company has a Linux- based network. You want to disable a printer from the network. Which of the following commands will you use to accomplish the task?

  A. lpq
  B. lprm
  C. lpc
  D. lpr
  C. lpc

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  Explanation/Reference:

  The lpc command is used to check the status of printers, enable and disable printers, and change the arrangement of jobs in the print queue.

  Answer option D is incorrect. The lpr command sends a job to the queue to be printed. Answer option A is incorrect. The lpq command views the contents of the print queue. Answer option B is incorrect. The lprm command removes a job

  from the print queue.

• Question 126:

  You work as the Network administrator for McNeil Inc. The company has a Linux-based network. You are working as a root user on the Linux operating system. You have created a PostScript file on your system. You want to convert this file to a PDF file. Which of the following commands should you use to accomplish the task?

  A. ps2pdf
  B. evince
  C. pdf2ps
  D. enscript
  A. ps2pdf

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  Explanation/Reference:

  The ps2pdf utility is used to convert PostScript to a PDF file.

  What is a ps2pdf command?

  The ps2pdf command creates PDF files. It is used to convert a PostScript file to a PDF file. There are a number of versions of this program, some are as follows:

  

  Answer option D is incorrect. The enscript utility converts a text to a PostScript format and sends it to a file or the print queue.

  Answer option B is incorrect. The evince utility is used to view a PDF file, not to create a PDF file.

  What is the evince command?

  The evince command is a document viewer capable of displaying multiple and single page document formats such as PDF and Postscript.

  Syntax: evince [Options] [Filename]

  

• Question 127:

  You work as a 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 see the file permissions on a file. Which of the following commands will you use to accomplish the task?

  A. cat
  B. ls -l
  C. ls
  D. ls -perm
  B. ls -l

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  Explanation/Reference:

  The ls -l command shows the permissions on a specified file. Answer option C is incorrect. The ls command without arguments lists the file and directory names in the current directory. Answer option D is incorrect. No such command exists in Linux. Answer option A is incorrect. The cat command shows the contents of a file.

• Question 128:

  Which of the following directories cannot be placed out of the root filesystem?

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

  A. /sbin
  B. /etc
  C. /lib
  D. /var
  A. /sbin
  B. /etc
  C. /lib

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  Explanation/Reference:

  The following directories cannot be separated from the root filesystem: /lib /dev /etc /sbin /bin Answer option D is incorrect. /var can be separated from the root filesystem. Such filesystems are known as optional filesystems. Some of the optional filesystems are as follows: /var /usr /opt /home

• Question 129:

  You work as a 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 to see all directories and files, including hidden files of your home directory in long listing format. Which of the following command-line utilities would you use to accomplish this task?

  A. ls -al /root
  B. ls
  C. ls -s /root
  D. ls -h /root
  A. ls -al /root

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  Explanation/Reference:

  The ls -al /root command lists all the files and directories, including hidden files in the /root directory, in long listing format. /root is the root user's home directory.

  What is the ls command?

  The ls command is used to list files on a Linux computer. The syntax of the ls command is as follows:

  ls [option] [directory name]

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

  

  For example, the following command displays all the files (including hidden files) in the /home directory and the contents in the subdirectories: ls -aR /home Answer option B is incorrect. The ls command without arguments lists the file and directory names in the current directory. Answer option C is incorrect. The ls -s /root command shows the size of all files and directories (in blocks, not bytes) that reside in the /root directory. Answer option D is incorrect. The ls -h /root command shows the size of files and directories in "human readable format" (i.e. 19M, 3G, etc). Answer option C is incorrect. The pdf2ps utility is used to convert a PDF file to a PostScript.

• Question 130:

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

  You are working as a root user on the Red Hat operating system. Joe is a user in your company. You want to remove Joe's tmp files that are 3 days older. Which of the following command syntaxes should you use to accomplish the task?

  A. find /tmp -cmin +3 -user Joe -ok rm {} \;
  B. find /tmp -ctime +3 user Joe -ok rm {} \;
  C. find /tmp -ctime +3 -user Joe -ok rm {} \;
  D. find /tmp -cmin +3 user Joe -ok rm {} \;
  C. find /tmp -ctime +3 -user Joe -ok rm {} \;

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  Explanation/Reference:

  This command will prompt you to remove Joe's tmp files that are 3 days older. When the - ok option is used with the find command it causes find to execute the rm command once for each /tmp file that is 3 days older. {} can be used as a

  filename placeholder. The -ok option with the find command is used to execute a command once for each file that matches the given criteria. This is commonly used in situations such as removing files or renaming files to have a certain

  extension. The -ok option causes find to ask for each file before removing it.

  What is the find command?

  The find command is a versatile method for locating files on a file system. The syntax for this command is as follows:

  find -

  Some of the important criteria are described in the table below:

  

  What are some numeric criteria that the find command uses? The find command can search your system for files that comply with certain numeric criteria. For

  example, -ctime, -atime, cmin, -amin, etc. The -ctime and -atime are measured in days and the -cmin and -amin are measures in minutes.

  For example:

  find /tmp -ctime +10

  This command searches for files that are more than 10 days older.

  find /tmp -cmin +10

  This command searches for files that are more than 10 minutes older. What is the purpose of using \; at the end of the find command? The purpose of using \; at the end of the find command is that when find is used with -exec and 璷k the find

  command uses ; as the delimiting character. Unfortunately ; is also a delimiting character for the bash shell so we must prevent bash from interpreting it. When a character is preceded with a backslash (\), bash instructs it literally, so typing \;

  at the bash command prompt will send ; to find command after bash has done its interpretation. Answer option A is incorrect. This command will prompt you to remove Joe's tmp files that are 3 minutes older.

  Answer options D and B are incorrect. These are the incorrect command syntaxes.