chapter 2 updates

course/README.md

@@ -13,7 +13,7 @@ In my many years working in the field, I have noticed a range of challenges and
  <b>DevOps has its challenges:</b>
 * There is no simple starting point to start learning about DevOps
 * DevOps requires a very broad range of skills that can be very overwhelming for new people to learn
-* DevOps is often treated as "Dev" and "Ops" which means you need understanding of two broad fields
+* DevOps is often treated as "Dev" and "Ops" which means you need understanding of two very broad fields
 * DevOps technologies are littered with buzz words, such as cloud, AI, machine learning, CI/CD, scalability, immutable infrastructure, automation, security and it never ends
 
 <b>Qualifications have its challenges:</b>
@@ -27,7 +27,7 @@ In my many years working in the field, I have noticed a range of challenges and
 * Often only solve really specific problems, and miss real world problems
 * Develop very narrow focussed problem solving skill
 * Miss out on powerful open source skills
-* Vendor locking 
+* Vendor locking: Often stuck only specialising in one vendor's product
 
 ## 🎯 Course Goals & Expectations
 

course/chapters/chapter-2-operating-systems/README.md

@@ -1,6 +1,6 @@
 # Chapter 2 : Operating Systems
 
-Back to [Course Introduction](../../README.md)
+Back to [Course Introduction](../../README.md#table-of-contents)
 
 ### 🎬 [Module 1: Introduction Operating Systems for DevOps](../../content/operating-systems/introduction/README.md)
 

course/content/operating-systems/commandline/introduction/README.md

@@ -143,9 +143,18 @@ Above, `-m` stands for message.
 * `pwd` : Writes the full path of the currend working directory to the screen
 * `touch` : Creates a file without content
 * `nano` : Starts a simple Linux text editor
+* `mkdir` : Create a directory
 * `cp` : Copies a file or directory
 * `mv` : Renames a file or directory. Useful for renaming files or moving content
 * `rm` : Removes a file or directory
+* `grep` : Find text in a file or in output
+* `df` : Displays the amount of disk space available on the file system
+* `du` : Estimates file space usage for a directory
+* `ps` : Displays information about active processes. `ps aux` displays all processes
+* `top` : Command line utility to monitor system load
+* `kill` : Terminates a process by process ID
+* `wget` : Downloads files from the web
+* `curl` : Create and send a Web request to a server
  
 ## Command inputs and outputs
 

course/content/operating-systems/linux/introduction/README.md

@@ -18,7 +18,7 @@ There are many popular Linux Distros, including Ubuntu, Debian, Arch Linux, Fedo
 For this module, you will need access to a Linux server. </br>
 See the Preface section above for a link to the chapter overview page where you will find the module on Servers & Virtualization for creating a Virtual Server. </br>
 
-Checkout [chapter 2: module: Introduction to Servers & Virtualization](../../../chapters/chapter-2-operating-systems/README.md) if you need to create a Linux server </br>
+Checkout the <b>Introduction to Servers & Virtualization</b> in [Chapter 2](../../../../chapters/chapter-2-operating-systems/README.md) if you need to create a Linux server </br>
 
 ## Terminal, Shell & Command Line