Change chapter 3

contents/03- Operate running systems/01- Boot, reboot, and shut down a system normally.md

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+## 01- Boot, reboot, and shut down a system normally:
+
 The RHCSA exam topic **"Boot, reboot, and shut down a system normally"** is fundamental for system administration. This topic tests your ability to start, restart, and power off a system using standard Linux commands. You must know how to interact with **`systemctl`**, the **GRUB bootloader**, and handle tasks related to managing system services during the boot process.
 
 ---

contents/03- Operate running systems/02- Boot systems into different targets manually.md

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+## 02- Boot systems into different targets manually:
+
 The RHCSA exam topic **"Boot systems into different targets manually"** focuses on your ability to control how a Linux system boots using **systemd targets**. In systemd-based systems (such as RHEL), **targets** are analogous to runlevels in older SysVinit systems, determining the operational state of the system (e.g., graphical mode, multi-user mode, or rescue mode).
 
 Understanding how to boot into different targets is essential for troubleshooting, configuring boot behavior, and maintaining systems. This includes switching between targets in a running system, changing the default boot target, and booting into specific targets using the **GRUB bootloader**.

contents/03- Operate running systems/03- Interrupt the boot process in order to gain access to a system.md

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+## 03- Interrupt the boot process in order to gain access to a system:
+
 The RHCSA exam topic **"Interrupt the boot process in order to gain access to a system"** is crucial for situations where you need to recover a system, reset forgotten passwords, or fix critical boot issues. You need to understand how to interrupt the boot process using the **GRUB bootloader** to gain privileged access (often root access) without requiring the system’s normal authentication process.
 
 This knowledge is essential for troubleshooting and recovering systems that cannot be accessed normally.

contents/03- Operate running systems/04- Identify CPU and Memory intensive processes and kill processes.md

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+## 04- Identify CPU and Memory intensive processes and kill processes:
+
 The RHCSA exam topic **"Identify CPU/memory intensive processes and kill processes"** tests your ability to monitor system performance, identify resource-hungry processes, and terminate those processes if necessary. This skill is essential for managing system resources, troubleshooting performance issues, and maintaining system stability.
 
 

contents/03- Operate running systems/05- Adjust process scheduling.md

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+## 05- Adjust process scheduling:
+
 The RHCSA exam topic **"Adjust process scheduling"** tests your understanding of how to manage process priorities in Linux using the **nice** and **renice** commands. These commands allow you to adjust the **priority** at which processes run, which directly impacts how much CPU time they receive. Processes with higher priority will get more CPU time, while those with lower priority will get less.
 
 

contents/03- Operate running systems/06- Manage tuning profiles.md

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+## 06- Manage tuning profiles:
+
 The RHCSA exam topic **"Manage tuning profiles"** involves the use of the **`tuned`** service to optimize system performance for different workloads. **`tuned`** is a daemon that dynamically adapts the system settings based on the active profile, which can be optimized for tasks such as power saving, throughput, or latency.
 
 

contents/03- Operate running systems/07- Locate and interpret system log files and journals.md

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+## 07- Locate and interpret system log files and journals:
+
 The RHCSA exam topic **"Locate and interpret system log files and journals"** tests your ability to work with system logs, which are crucial for troubleshooting, monitoring, and maintaining system health. On **RHEL-based systems**, logs are managed by **`rsyslog`** and the **systemd journal**, and you’ll need to be able to locate, view, and interpret these logs.
 
 ---

contents/03- Operate running systems/08- Preserve system journals.md

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+## 08- Preserve system journals:
+
 For the **RHCSA (Red Hat Certified System Administrator) exam**, the topic of **preserving system journals** refers to managing the system logs that are stored by the **`systemd` journal**, which is a central component responsible for logging system activities and events on a Red Hat-based Linux system (like RHEL or CentOS).
 
 

contents/03- Operate running systems/09- Start, stop, and check the status of network services.md

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+## 09- Start, stop, and check the status of network services:
+
 For the **RHCSA Exam** topic **"Start, stop, and check the status of network services"**, you'll need to demonstrate your ability to manage network-related services on a Red Hat-based system using `systemctl`, the command-line tool for interacting with the `systemd` system and service manager. Network services can include `NetworkManager`, `sshd`, and others related to networking functionality.
 
 Here’s what you need to know and some example questions:

contents/03- Operate running systems/10- Securely transfer files between systems.md

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+## 10- Securely transfer files between systems:
+
 The RHCSA exam topic **"Securely transfer files between systems"** focuses on securely transferring files between different Linux systems using tools like **`scp`** (secure copy), **`sftp`** (secure file transfer protocol), and **`rsync`** over SSH. These tools are essential for moving files across systems securely by encrypting the transfer to prevent eavesdropping and unauthorized access.
 
 

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