Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 151:

  Which of the following commands can be used to delete all jobs queued in a printer?

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

  A. lprm -a all
  B. lprm -all
  C. lprm - *
  D. lprm
  A. lprm -a all

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  Explanation/Reference:

  The lprm - and lprm -a all commands can be used to delete all jobs queued in a printer. The lprm command is used to remove the print jobs that have been queued for printing. If no arguments are supplied, the current job on the default

  destination is cancelled. The command syntax for the lprm command is as follows:

  lprm [-E] [-U username] [-h server[:port]] [-P destination[/instance]] [-] [job ID(s)] where,

  

  Answer options B and C are incorrect. These are not valid lprm command syntaxes.

• Question 152:

  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. Which of the following commands will John use to display information about all mounted file systems?

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

  A. df
  B. du
  C. ls
  D. df -m
  A. df
  D. df -m

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  Explanation/Reference:

  According to the scenario, John can use any of these two commands. The df command will display information about all mounted file systems in KB while the df -m command will display information in MB.

• Question 153:

  You have made a program secure.c to display which ports are open and what types of services are running on these ports. You want to write the program's output to standard output and simultaneously copy it into a specified file. Which of the following commands will you use to accomplish the task?

  A. less
  B. tee
  C. cat
  D. more
  B. tee

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  Explanation/Reference:

  You will use the tee command to write its content to standard output and simultaneously copy it into the specified file. The tee command is used to split the output of a program so that it can be seen on the display and also be saved in a file. It can also be used to capture intermediate output before the data is altered by another command or program. The tee command reads standard input, then writes its content to standard output, and simultaneously copies it into the specified file

  (s) or variables. The syntax of the tee command is as follows: tee [-a] [-i] [File] where, the -a option appends the output to the end of File instead of writing over it and the -i option is used to ignore interrupts.

  Answer option C is incorrect. 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. 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 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,