Red Hat RH033 Online Practice Questions and Exam Preparation

Red Hat RH033 Online Questions & Answers

• Question 111:

  Fill in the blank with the appropriate command to complete the statement below. In order to run the

  httpd process with the highest priority, you will issue the _______ command to change the priority level of the httpd process.

  nice

  Explanation/Reference:

  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.

• Question 112:

  Which of the following utilities will resume suspended jobs from the current environment if job control is enabled?

  A. jobs
  B. bg
  C. top
  D. fg
  B. bg

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  Explanation/Reference:

  The bg utility resumes suspended jobs from the current environment by running them as background jobs if job control is enabled. If the job specified by job_id is already a running background job, the bg utility will have no effect and shall exit

  successfully. Using bg to place a job into the background will cause its process ID to become "known in the current shell execution environment", as if it had been started as an asynchronous list. Answer option D is incorrect. The fg utility

  continues a stopped job by running it in the foreground, some shells are not able to run this command.

  Syntax:

  fg [%job] Where %job specifies the job that a user wants to run in the foreground. Answer option A is incorrect. The jobs command lists the jobs that are running in the background and in the foreground. If the prompt is returned with no

  information, no jobs are present.

  Syntax: jobs [-p | -l] [-n] [-p] [-x] [job id]

  Some important options used with jobs command are as follows:

  

  Answer option C is incorrect. The top command is used to produce a frequently-updated list of processes. By default, the processes are ordered by percentage of CPU usage, with only the "top" CPU consumers shown. This command shows how much processing power and memory are being used, as well as other information about the running processes. The following figure demonstrates the output of the top command:

  

• Question 113:

  Which of the following commands copies files between hosts on a network and uses the same authentication as ssh, and will ask for passwords or passphrases if they are needed for authentication?

  A. scp
  B. rcp
  C. cp
  D. mv
  A. scp

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  Explanation/Reference:

  The scp command copies files between hosts on a network. It uses ssh for data transfer, and uses the same authentication and provides the same security as ssh. Unlike rcp, scp will ask for passwords or passphrases if they are needed for authentication. Any file name may contain a host and user specification to indicate that the file is to be copied to/from that host. Copies between two remote hosts are permitted. Answer option B is incorrect. The rcp command copies files

  between machines. The rcp command does not prompt for passwords; it uses Kerberos authentication when connecting to rhost.

  Answer option C is incorrect. The cp command copies files and directories. It is generally used to make a backup copy of a file or to copy a file from one directory to another. Answer option D is incorrect. The mv command moves files and

  directories from one directory to another or renames a file or directory.

• Question 114:

  You are 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 move a file from one location to another. Which of the following commands should you use to accomplish this task?

  A. cp
  B. ls
  C. move
  D. mv
  D. mv

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  Explanation/Reference:

  The mv command is used to move a file from one location to another.

• Question 115:

  What will be the output of the following command? echo $(date %M) > date.txt

  A. It will print a string "date %M".
  B. The current time (Month) will be written in the date.txt file.
  C. The current time (Minutes) will be written in the date.txt file.
  D. It will create a variable $(date %M).
  C. The current time (Minutes) will be written in the date.txt file.

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  Explanation/Reference:

  The date command with the %M specifier prints the current time (Minutes). Since the output is redirected towards the date.txt file, the current time (Minutes) will be printed in the date.txt file.

• Question 116:

  You run the ps -aux command on the terminal. You get the following output:

  You notice that the process id 24224 is showing the status message S on the stat column.

  What does this indicate?

  A. The process id 24224 is in sleeping status.
  B. The process id 24224 is hanged.
  C. The process id 24224 is in stopped status.
  D. The process id 24224 is in running status.
  A. The process id 24224 is in sleeping status.

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  Explanation/Reference:

  According to the scenario, the S status message shows that the process id 24224 is in sleeping status.

  The ps -aux command reports the status of processes currently running on a Linux computer. It shows the following status messages:

  

• Question 117:

  You want to check whether the cc process is running on a computer. Which of the following commands can you use to accomplish the task? Each correct answer represents a complete solution. Choose all that apply.

  A. ps -aux | more
  B. tail -f
  C. ps -aux | grep cc
  D. ps -aux
  A. ps -aux | more
  C. ps -aux | grep cc
  D. ps -aux

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  Explanation/Reference:

  You can view all running processes with the help of the ps -aux command. Hence, any of the ps 璦ux commands (i.e., ps -aux | grep cc, ps -aux | more, or ps -aux) can be used to check whether the cc process is running on the computer. Answer option B is incorrect. The tail command is used to display the last few lines of a text file or piped data. It has a special command line option -f (follow) that allows a file to be monitored. Instead of displaying the last few lines and exiting, tail displays the lines and then monitors the file. As new lines are added to the file by another process, tail updates the display. This is particularly useful for monitoring log files. The following command will display the last 10 lines of messages and append new lines to the display as new lines are added to messages: tail -f /var/adm/messages

• Question 118:

  You work as a Network Administrator for Rick International. The company has a Linux- based network. A process is running on a server. It is using a lot of processing power. You want the process to use less resources. Which of the following actions will you perform to accomplish the task?

  A. Kill the process and rerun it by using the nice command with the -n 1 switch.
  B. Kill the process and rerun it by using the nice command with the -n 19 switch.
  C. Kill the process and rerun it by using the fg command.
  D. Kill the process and rerun it by using the bg command.
  B. Kill the process and rerun it by using the nice command with the -n 19 switch.

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  Explanation/Reference:

  In order to accomplish the task, you will have to kill the process and rerun it by using the nice command to lower the priority of the process.

  You will have to run the following command: kill : nice -n 19 The nice command is used to run a process with the desired priority level. The priority level varies from 1 to 19. Level 1 is for the highest priority and

  level 19 is for the lowest. By default, every process runs with the priority level 10. Answer option C is incorrect. The fg command is used to run a process in the foreground. Answer option D is incorrect. The bg command is used to run a

  process in the background. Answer option A is incorrect. The -n 1 switch will provide the process the top priority.

• Question 119:

  Fill in the blank with the command to complete the statement below. Do not enter the full path of the command.

  The ___________ command is used to remove the print jobs that have been queued for printing by using a secure connection.

  lprm -E

  Explanation/Reference:

  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,

  

• Question 120:

  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 Linux operating system. You have created a file in the vim text editor. You want to save this file and exit it. Which of the following keys should you use to accomplish the task?

  A. :w
  B. :wq
  C. :q!
  D. :
  B. :wq

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  Explanation/Reference:

  creates a command prompt at bottom-left of screen. w will save the file and q will quit from the file. When :wq is used in combination and then the Enter key is pressed, this will save the file and exit it.

  Answer option D is incorrect. : enters EX mode. EX mode will open a prompt on the last line of the terminal, and will accept certain keys for commands. Answer option A is incorrect. :w only saves a file on the disk. To quit from the file after

  saving its contents, use q after :w.

  Answer option C is incorrect. This key is used to quit from the file without saving its contents.