Code Snippets
Working code you can lift straight into a project: shell, Python, TypeScript, Terraform. Each snippet says what it does and where it bites.
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Bash Script Locking: Prevent Concurrent Runs with a PID File
- Bash
- Automation
- 18 Aug, 2026
- 04 Mins read
Quick Tip Wrap any script that must not run twice at once in a PID-file lock, and a second copy simply exits instead of corrupting your data. The Problem The Problem Cron does not c
AWS DynamoDB CRUD Operations in Node.js with the AWS SDK v3
Quick Tip Wrap the low-level DynamoDB client in a DynamoDBDocumentClient so you pass plain JavaScript objects in and get plain objects back, then guard your writes with ConditionExpression an
Python Async HTTP Requests with aiohttp: Fetch Multiple URLs Concurrently
Quick Tip Reuse one aiohttp session, fan your requests out with asyncio.gather, and cap them with a semaphore to fetch hundreds of URLs in the time one loop would take. The Problem **The
Bash Retry Function: Automatically Retry Failing Commands with Exponential Backoff
- Devops
- Shell scripting
- 20 Jul, 2026
- 05 Mins read
Quick Tip Wrap any flaky command in one reusable retry function and stop re-running red pipelines by hand. The Problem The Problem Some commands fail for reasons that have nothing to
Node.js Environment Variable Validation with Zod at Startup
- Nodejs
- Typescript
- 27 May, 2026
- 07 Mins read
Most Node.js apps treat process.env like a trusted friend. You reach into it whenever you need a value, assume the key is there, assume it's spelled right, and assume the string is actually the type
AWS EC2 Instance Management with Boto3: Start, Stop, and Query Instances
If you've ever spent 20 minutes clicking through the AWS Console just to stop a handful of dev instances, you already know the pain. It's tedious, it doesn't scale, and one wrong click can ruin your a
Redis Caching Patterns: Cache-Aside, Write-Through & Cache Invalidation
- Backend
- Performance
- 07 Apr, 2026
- 05 Mins read
Need to scale your backend without throwing money at servers? Start with Redis caching patterns. Most databases can handle hundreds of queries per second, but thousands? Your app slows to a crawl
PostgreSQL Query Optimization: Indexes, EXPLAIN ANALYZE & Execution Plans
- Database
- Performance
- 29 Mar, 2026
- 05 Mins read
Need to optimize slow PostgreSQL queries? Use EXPLAIN ANALYZE and targeted indexing. Slow database queries kill application performance. Most developers don't know where the actual bottleneck is,
Multi-Environment Secret Management with HashiCorp Vault
Managing secrets safely across multiple environments with HashiCorp Vault Storing secrets in .env files, hardcoding them, or even using separate secret managers per environment creates security
Top 7 Open Source OCR Models for Document Processing
- Ai ml
- Computer vision
- 09 Jan, 2026
- 04 Mins read
AI Tool Turn your documents into accurate digital copies with these open source OCR models. Instead of fighting messy text extraction, you get clean markdown from PDFs, images, and scanned docume
Why printf Beats echo in Linux Scripts
- Shell scripting
- Devops
- 02 Jan, 2026
- 03 Mins read
Scripting Tip A script that works on your machine can produce different output on another system. The output command is often the reason. printf behaves the same way across shells, and echo d
Essential Bash Variables for Every Script
- Shell scripting
- Devops
- 26 Dec, 2025
- 08 Mins read
Overview Quick Tip You know what's worse than writing scripts? Writing scripts that break every time you move them to a different machine. Built-in Bash variables fix that. The problem wi
Per-App Shell History for Bash
- Shell scripting
- Productivity
- 18 Dec, 2025
- 02 Mins read
Organize your Bash history per terminal app. Ever jumped between iTerm2, Ghostty, and VS Code's terminal only to have your command history get all mixed up? This Bash snippet keeps things clean b
Per-App Shell History for Zsh
- Shell scripting
- Productivity
- 18 Dec, 2025
- 02 Mins read
Organize your shell history per terminal app. Ever jumped between iTerm2, Ghostty, and VS Code's terminal only to have your command history get all mixed up? This Zsh snippet keeps things clean b
Optimizing your python code with __slots__?
- Python
- Productivity
- 16 Jul, 2025
- 04 Mins read
Memory optimization with slots Understanding the problem Optimizing data models in big data workflows with slots In big data and MLOps workflows, you often work with massive
AWS Secrets Manager
Loading secrets in a Node.js app without exposing them If you're still storing API keys or database credentials in .env files or hardcoding them into your codebase, it's time for a better appro
Check S3 Bucket Existence
- Aws
- Shell scripting
- 11 Jun, 2025
- 02 Mins read
Quick Tip Don't let your deployment blow up because of a missing S3 bucket. This Bash script lets you check if a bucket exists before anything fails. The Problem Missing bucket failure