From Mechanical Engineering to DevSecOps: Mastering Linux Fundamentals

Journal Log no. 1 Linux Unhatched ; My DevSecOps Journey

Lucas Vaz, a B.Eng in Mechanical Engineering, has pivoted his career toward DevSecOps by applying system logic to cloud engines. After earning a Google IT Automation with Python Professional Certificate, he is now documenting his mastery of Linux terminal fundamentals. This journey bridges the gap between physical safety protocols and digital automation.

Why This Matters

In technical environments, the transition from physical systems to cloud infrastructure requires a shift from mechanical locks to digital permissions. Lucas Vaz demonstrates that Linux commands like chmod and chown are the digital equivalents of industrial safety protocols, where unauthorized access to a machine’s ‘engine’ can lead to critical system failures. Understanding these fundamentals is essential for DevSecOps professionals to prevent ‘Permission denied’ errors that halt automated pipelines.

Key Insights

• Google IT Automation with Python Professional Certificate, 2026: Lucas Vaz utilizes this credential as a foundation for transitioning into cloud-based DevSecOps.
• Safety Protocols Analogy: File permissions (chmod) and ownership (chown) function as digital locksmithing, mirroring physical security in mechanical engineering.
• Terminal Automation: Use of ‘grep -i’ for case-insensitive pattern matching and ‘ifconfig’ for network interface configuration within an NDG Virtual Machine.
• Administrative Root Privileges: The ‘sudo’ prefix is critical for executing system-level changes, such as updating user credentials with ‘passwd’.
• File Access Levels: Implementing ‘chmod 700’ ensures that sensitive files remain restricted solely to the owner, a core tenet of system security.

Working Examples

User management and security configuration to restrict file access to the owner.

sudo passwd [username]
sudo chmod 700 secret_file

Granting execution rights to a shell script to resolve ‘Permission denied’ errors.

chmod +x script.sh
./script.sh

Practical Applications

• Use case: Securing sensitive environment variables using ‘chmod 700’ to prevent unauthorized user access. Pitfall: Forgetting to apply ‘+x’ flags on automation scripts, causing deployment pipeline failures.
• Use case: Utilizing ‘grep -i’ within a Python subprocess module to automate log analysis. Pitfall: Running administrative commands without the ‘sudo’ prefix, resulting in denied system requests.

References:

• https://dev.to/lvazmecheng/journal-log-no-1-linux-unhatched-my-devsecops-journey-a91