RHCSA9 Exam Series: Understand and use essential tools

June 10, 2022
5:32 pm

In this section of the RHCSA9 Exam Series: Understand and use essential tools, we will examine some of the essential tools that may appear on the RHCSA9 exam and review different ways to accomplish administrative tasks within RHEL9 operating system (OS). Some of the commands we will review in this lab include:

mkdir
rmdir
rm
find
ls
mv
cp
cd
touch
pipes
exec
pwd
redirection
chmod
useradd
chown
umask
tar
gzip

Introduction

Before we begin, this article assumes that you already have running instances of RHEL9 or CentOS9 available. If not, you may reference the following articles for RHEL7 or CentOS8 installation procedures. You’ll find the instructions for installing RHEL9 are similar with a few obvious exceptions (e.g. you’ll download a different .iso).

Image by Miguel A. Padrinan from Pexels

Lab Objectives: Environment Setup

To adhere completely to the lab instructions, you’ll need one running instance or virtual machine (also referred to as a node). You can name it whatever you want but for simplicity sake, we’ll name this machine as follows:

				
					* node1.infotechys.example.com

**READ ALL OF THE INSTRUCTIONS BEFORE STARTING THE LAB**

Also, make sure to save off an image backup of your node or take a snapshot of the machine’s state before starting this lab. It will allow you to revert to a clean slate and repeat the labs as many times as you need.

RHCSA9 Exam Series: Lab Instructions

Complete each bullet (below) on your machine (node1) as the root user.

Section #1: 10-15 minutes

Create a directory under /opt called next_project_files
Under the newly created directory, create twenty(20) text files in sequential order (e.g file1.txt, file2.txt, file3.txt, etc…)
Redirect the output of the df -Ph command into the first three(3) text files (e.g. file1-3.txt)
List the /etc directory and redirect its contents into file4-8.txt
List the /usr/local directory and redirect its contents into file9.txt and file10.txt
Rename file4-10.txt to systemfile4-10.data
Append the word count output of each of the following .data files to file4.txt
- systemfile4.data
- systemfile5.data
- systemfile6.data
Redirect the first line in file4.txt to file5.txt
Append the word count output of systemsfile9.data to file5.txt
Redirect a list of only files with the keyword .conf from systemfile6.data to file6.txt
Redirect the word count output of file6.txt to file7.txt

Section #2: 10-15 minutes

Create a new directory under next_project_files called modified
Under the modified directory, redirect all files with the .data extension to file8.txt
Under the modified directory, redirect all setuid files to file9.txt
Under the modified directory, redirect all setgid files to file10.txt
Under the modified directory, redirect the contents of file8, 9, and 10 to file11.txt
Redirect the word count output of file11.txt to file12.txt
Remove file11.txt and file12.txt from the next_project_files directory
Remove all empty files from the next_project_files directory and move all remaining files with a .txt extension to the modified directory.
Archive the contents of next_project_files to a file called projects.tgz
Create a new user called testuser
Copy the archived file to testuser’s home directory
Set the umask for testuser so that only the owner and group have read and write permissions.
Set the permissions for the archived file so the owner has read and write permissions; set the group permissions to read only permissions; set no permissions to others.

NOTE: Challenge yourself! Set a timer before starting this lab and try to complete the tasks above in 20 minutes or less. The RHCSA exam is three(3) hours long which is plenty of time if you manage it wisely!

Conclusion

Congratulations! You’ve just completed the Understand and use essential tools section of the RHCSA9 exam series. If it took you a while to complete, keep practicing until you can get it done in a shorter time period. Click this link for the answer page and compare your results. Was this article helpful to you? If so, leave us some feedback in the comments section. We’d love to hear from you.

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RHCSA9 Exam Series: Understand and use essential tools

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