Practical Tech Monthly

🧠 One insight from Jesus Daniel

Most security tutorials teach you what a port scan is. Few teach you how to build one yourself in 20 minutes.

This month, I'm sharing three Python scripts that solve real security problems — not toy examples. You'll leave with working tools you can adapt, extend, and actually use.

🔧 New this month: Python for Security Automation

A complete, step-by-step tutorial where you build three real security tools:

• Port scanner — finds open ports on any host (concurrent, fast, production‑ready)
• Log analyzer — parses web server logs, flags brute force attempts and attack patterns
• Hash verification utility — detects file tampering using SHA‑256

📌 Start the full tutorial →

"By the end, you'll understand how Python applies directly to security work — and have three working tools you can adapt."

Direct links to each tool in the tutorial:

• Build the Port Scanner
• Build the Log Analyzer
• Build the Hash Verification Utility

⌨️ One tool or command (for developers)

Hash a file from the terminal (no script needed):

# SHA-256 (most common)
sha256sum yourfile.txt

# On macOS
shasum -a 256 yourfile.txt

# MD5 (faster, but less secure)
md5sum yourfile.txt

Why this matters: Before you run a downloaded binary or open a configuration file, hash it and compare against the official value. If they don't match → stop. That's file integrity checking in one command.

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About the author

Jesus Daniel Mollineda is a technology educator focused on clear, actionable content for developers, leaders, and decision-makers. All guides and tutorials are free at jdmollineda.com.

This education hub exists because too much tech content is either overly complex or missing practical context. Every guide, tutorial, and resource here is built for clarity, depth, and real-world applicability.