I graduated with a B.Eng in Mechanical Engineering in 2018, but my career path has always been driven by the logic of systems. After earning my Google IT Automation with Python Professional Certificate, I realized that the most powerful engines today are built in the cloud.
I am now officially on my journey toward DevSecOps. This log marks the first step to my goal.
📙 Journal Log: 2026-04-05
🎯 Today's Mission
Mastering the Fundamentals: Bridging the gap between physical systems thinking and terminal based automation
🛠️ Environment & Setup
- Machine/OS: NDG Virtual Machine (Ubuntu-based)
-
Current Directory:
~/home/sysadmin
⌨️ Commands & Flags Learned
| Command | Flag/Context | What it does |
|---|---|---|
ls |
-l |
Lists files in long format (essential for checking permissions). |
chmod |
+x |
Changes file access levels—the Digital Locksmith. |
chown |
user:group |
Changes file ownership; critical for system security. |
sudo |
(Prefix) | Executes commands with administrative Root privileges. |
grep |
-i |
Filters output (Case-insensitive search for patterns). |
ifconfig |
(No flag) | Displays network interface configuration and IP addresses. |
📂 System Changes / Configurations
# Practiced user management and security configuration
sudo passwd [username] # Updated user credentials to secure the environment.
sudo chmod 700 secret_file # Restricted a file so only the owner can access it.
🛑 The "Terminal Wall" (Errors & Fixes)
The Error: bash: ./script.sh: Permission denied
The Solution: In the physical world, you need a key for a control panel. In Linux, you need execution rights. I ran chmod +x script.sh and the Permission denied error vanished.
💡 Linux "Aha!" Moment
I realized that chmod and chown are the digital versions of Safety Protocols in Mechanical Engineering. In a factory, only authorized personnel have the key to the machine; in Linux, permissions ensure only the right process or user can touch the engine of the OS.
🔗 Related Notes
Next Milestone: Transitioning from Linux Unhatched to Cisco Linux Essentials to earn my formal completion certificate.
Python Integration: Exploring how the subprocess module can automate the grep and chmod tasks I practiced today.
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