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✨ Add SEO updates workflow, sitemap, and robots.txt; enhance README and HTML metadata
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‎.github/workflows/seo-updates.yml‎

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name: SEO Updates
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on:
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push:
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branches: [ master ]
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workflow_dispatch:
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jobs:
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update-seo:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Update sitemap lastmod dates
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run: |
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# Update sitemap.xml with current date
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current_date=$(date +"%Y-%m-%d")
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sed -i "s/<lastmod>.*<\/lastmod>/<lastmod>$current_date<\/lastmod>/g" sitemap.xml
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- name: Commit changes
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run: |
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git config --local user.email "action@github.com"
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git config --local user.name "GitHub Action"
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git add sitemap.xml
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git diff --staged --quiet || git commit -m "Auto-update sitemap lastmod dates"
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git push

‎README.md‎

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# Cheat sheets
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# Programming Cheat Sheets - Developer Reference Guide
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Keep tracks of every useful tips & tricks
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A comprehensive collection of programming cheat sheets for developers. Quick reference guides covering **Python**, **Docker**, **Linux**, **Algorithms**, and more essential development topics.
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![](https://images.unsplash.com/photo-1481627834876-b7833e8f5570?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=928&q=80)
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Perfect for developers who want to boost productivity with practical tips, tricks, and code snippets that solve real-world problems.
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![Programming and development resources](https://images.unsplash.com/photo-1481627834876-b7833e8f5570?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1200&q=80 "Developer cheat sheets and programming references")
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📷 by [Janko Ferlič](https://unsplash.com/@itfeelslikefilm)
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## 🚀 What You'll Find Here
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This repository contains practical, ready-to-use code examples and configurations for:
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- **🐍 Python Development**: File operations, data structures, linting, OCR, and modern tools like UV
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- **🐳 Containerization**: Docker installation, configuration, and Portainer setup
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- **🐧 Linux Administration**: Shell configuration, system maintenance, and troubleshooting
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- **⚡ Algorithms**: Distance heuristics and computational concepts
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- **📦 DevOps Tools**: Package management, development servers, and workflow optimization
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## 📚 Browse Categories
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Each section contains detailed examples, best practices, and troubleshooting tips gathered from real-world development experience.
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### 🔧 Quick Navigation
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| Category | Topics Covered | Skill Level |
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|----------|----------------|-------------|
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| **Python** | Files, Lists, Dictionaries, OCR, DevPi, UV Package Manager | Beginner to Advanced |
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| **Containers** | Docker Setup, Portainer, Container Management | Intermediate |
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| **Linux** | Zsh, Starship, System Recovery | Beginner to Intermediate |
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| **Algorithms** | Distance Calculations, Optimization Techniques | Advanced |
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## 💡 Why These Cheat Sheets?
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- **Practical Focus**: Real solutions to common development problems
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- **Copy-Paste Ready**: Code that works out of the box
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- **Continuously Updated**: Based on current best practices and modern tools
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- **Developer Tested**: Used in production environments
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---
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*Last updated: September 2025 | Maintained by [Greums](https://github.com/greums)*

‎containerization/install-and-configure-docker.md‎

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## Configure remote access
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If you want to grant access from a remote [Portainer service](https://github.com/greums/cheat-sheets/blob/master/containerization/install-portainer-as-container.md), Docker daemon must be configured to listen on TCP port.
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If you want to grant access from a remote [Portainer service](containerization/install-portainer-as-container.md), Docker daemon must be configured to listen on TCP port.
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Create or update `/etc/docker/daemon.json`:
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```bash
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sudo nano /etc/docker/daemon.json

‎containerization/install-portainer-as-container.md‎

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## Prerequisite
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[Docker and Docker Compose](https://github.com/greums/cheat-sheets/blob/master/containerization/install-and-configure-docker.md) must be up and running before deploying Portainer.
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[Docker and Docker Compose](containerization/install-and-configure-docker.md) must be up and running before deploying Portainer.
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## Run Portainer container
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‎index.html‎

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<head>
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<meta charset="UTF-8">
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<title>Cheat Sheets</title>
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<title>Programming Cheat Sheets - Python, Docker, Linux & More | Developer Reference</title>
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
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<meta name="description" content="Description">
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<meta name="description" content="Comprehensive programming cheat sheets for developers. Quick reference guides for Python, Docker, Linux, algorithmic concepts, and more. Boost your coding productivity with practical tips and tricks.">
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<meta name="keywords" content="cheat sheets, programming, python, docker, linux, algorithms, developer, coding, reference, tutorial, guide">
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<meta name="author" content="Greums">
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<meta name="robots" content="index, follow">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
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<!-- Open Graph / Facebook -->
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<meta property="og:type" content="website">
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<meta property="og:url" content="http://keep.greums.xyz/">
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<meta property="og:title" content="Programming Cheat Sheets - Python, Docker, Linux & More | Developer Reference">
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<meta property="og:description" content="Comprehensive programming cheat sheets for developers. Quick reference guides for Python, Docker, Linux, algorithmic concepts, and more.">
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<meta property="og:image" content="https://images.unsplash.com/photo-1481627834876-b7833e8f5570?ixlib=rb-1.2.1&auto=format&fit=crop&w=1200&q=80">
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<!-- Twitter -->
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<meta property="twitter:card" content="summary_large_image">
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<meta property="twitter:url" content="http://keep.greums.xyz/">
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<meta property="twitter:title" content="Programming Cheat Sheets - Python, Docker, Linux & More | Developer Reference">
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<meta property="twitter:description" content="Comprehensive programming cheat sheets for developers. Quick reference guides for Python, Docker, Linux, algorithmic concepts, and more.">
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<meta property="twitter:image" content="https://images.unsplash.com/photo-1481627834876-b7833e8f5570?ixlib=rb-1.2.1&auto=format&fit=crop&w=1200&q=80">
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<!-- Canonical URL -->
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<link rel="canonical" href="http://keep.greums.xyz/">
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<!-- Theme color -->
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<meta name="theme-color" content="#404040">
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<!-- CSS -->
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsify@4/lib/themes/vue.css">
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsify-sidebar-collapse/dist/sidebar.min.css" />
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<!-- Structured Data -->
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<script type="application/ld+json">
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{
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"@context": "https://schema.org",
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"@type": "TechArticle",
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"headline": "Programming Cheat Sheets - Developer Reference Guide",
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"description": "Comprehensive programming cheat sheets for developers. Quick reference guides for Python, Docker, Linux, algorithmic concepts, and more.",
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"author": {
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"@type": "Person",
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"name": "Greums"
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},
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"publisher": {
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"@type": "Organization",
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"name": "Greums Cheat Sheets"
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},
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"url": "http://keep.greums.xyz/",
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"dateModified": "2025-09-27",
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"mainEntityOfPage": {
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"@type": "WebPage",
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"@id": "http://keep.greums.xyz/"
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}
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}
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</script>
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</head>
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<body>
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<div id="app"></div>
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<script>
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window.$docsify = {
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name: 'Cheat Sheets',
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name: 'Programming Cheat Sheets',
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repo: 'https://github.com/greums/cheat-sheets',
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themeColor: '#404040',
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loadSidebar: true,
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subMaxLevel: 2,
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subMaxLevel: 3,
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auto2top: true,
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coverpage: false,
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maxLevel: 4,
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loadNavbar: false,
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mergeNavbar: true,
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executeScript: true,
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noEmoji: false,
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search: {
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noData: 'No results!',
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paths: 'auto',
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placeholder: 'Search cheat sheets...',
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pathNamespaces: /^(\/(zh-cn|ru))?(\/(v1|v2))?/
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},
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copyCode: {
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buttonText: 'Copy to clipboard',
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errorText: 'Error',
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successText: 'Copied'
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},
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pagination: {
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previousText: 'Previous',
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nextText: 'Next',
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crossChapter: true,
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crossChapterText: true,
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}
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}
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</script>
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</body>
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<script src="https://unpkg.com/docsify-copy-code"></script>
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<script src="https://cdn.jsdelivr.net/npm/docsify-sidebar-collapse/dist/docsify-sidebar-collapse.min.js"></script>
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<script src="https://unpkg.com/docsify/lib/plugins/search.min.js"></script>
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<script src="https://unpkg.com/docsify-pagination/dist/docsify-pagination.min.js"></script>
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<script src="https://unpkg.com/docsify/lib/plugins/zoom-image.js"></script>
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<!-- Google Analytics -->
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<script async src="https://www.googletagmanager.com/gtag/js?id=G-TGLCCVZB2C"></script>
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<script>

‎python/files-and-directories.md‎

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# Files and directories
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# Python Files and Directories - Complete Guide with Examples
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![](https://images.unsplash.com/photo-1583521214690-73421a1829a9?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80)
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Master Python file and directory operations with practical examples and performance optimizations. Learn efficient ways to calculate directory sizes, handle file paths, and work with the filesystem.
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![Python file and directory operations examples](https://images.unsplash.com/photo-1583521214690-73421a1829a9?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1200&q=80 "Python programming for file system operations")
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📷 by [Wesley Tingey](https://unsplash.com/@wesleyphotography)
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> **Quick Reference**: Learn how to efficiently calculate directory sizes in Python using both sequential and concurrent approaches. Perfect for system administration and file management tasks.
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## Table of Contents
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- [Get Directory Size (Basic)](#get-total-size-of-a-directory)
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- [Optimized Directory Size Calculation](#faster-way-to-get-total-size-of-a-directory)
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- [Performance Comparison](#performance-analysis)
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- [Best Practices](#best-practices)
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## Get total size of a directory
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size : 55.09 GB
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```
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## Performance Analysis
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The concurrent approach provides a **4x speed improvement** for large directories with multiple subdirectories. Here's why:
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- **Sequential**: Processes files one by one
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- **Concurrent**: Utilizes multiple CPU cores for parallel processing
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- **Best for**: Large directories with many subdirectories
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## Best Practices
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### ✅ Do's
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- Use `pathlib.Path` for modern, readable path operations
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- Implement error handling for permission issues
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- Consider memory usage for very large directories
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- Use `ProcessPoolExecutor` for CPU-intensive tasks
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### ❌ Don'ts
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- Don't use string concatenation for paths
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- Avoid blocking the main thread for large operations
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- Don't ignore file access permissions
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## Additional File Operations
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### Check if Path Exists
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```python
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from pathlib import Path
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file_path = Path("example.txt")
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if file_path.exists():
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print("File exists!")
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```
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### Create Directories
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```python
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# Create directory with parents
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Path("path/to/new/directory").mkdir(parents=True, exist_ok=True)
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```
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### List Files with Filter
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```python
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# Get all Python files
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python_files = list(Path(".").glob("**/*.py"))
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print(f"Found {len(python_files)} Python files")
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```
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## Related Topics
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- [Python Lists and Dictionaries](lists-and-dictionaries.md) - Data structure operations
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- [Python Linting and Configuration](linting-and-configuration.md) - Code quality tools
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---
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**Keywords**: Python file operations, directory size calculation, pathlib, concurrent processing, filesystem programming, Python system administration

‎robots.txt‎

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User-agent: *
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Allow: /
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# Sitemap
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Sitemap: http://keep.greums.xyz/sitemap.xml
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# Crawl-delay (optional - helps prevent overwhelming your server)
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Crawl-delay: 1
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# Disallow specific paths if needed (currently allowing all)
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# Disallow: /private/
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# Disallow: /temp/

‎sitemap.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
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http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
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<!-- Homepage -->
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<url>
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<loc>http://keep.greums.xyz/</loc>
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<lastmod>2025-09-27</lastmod>
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<changefreq>weekly</changefreq>
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<priority>1.0</priority>
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</url>
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<!-- Containerization -->
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<url>
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<loc>http://keep.greums.xyz/#/containerization/install-and-configure-docker</loc>
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<lastmod>2025-09-27</lastmod>
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<priority>0.8</priority>
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<lastmod>2025-09-27</lastmod>
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<priority>0.8</priority>
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</url>
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<!-- Linux -->
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<url>
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<loc>http://keep.greums.xyz/#/linux/fix-a-corrupt-zsh-history-file</loc>
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<lastmod>2025-09-27</lastmod>
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<changefreq>monthly</changefreq>
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<priority>0.8</priority>
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<url>
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<loc>http://keep.greums.xyz/#/linux/install-zsh-and-starship</loc>
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<priority>0.8</priority>
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<!-- Algorithmic -->
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<url>
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<loc>http://keep.greums.xyz/#/algorithmic/distance-heuristics</loc>
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<lastmod>2025-09-27</lastmod>
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<priority>0.8</priority>
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</url>
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<url>
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<loc>http://keep.greums.xyz/#/python/optical-character-recognition</loc>
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<lastmod>2025-09-27</lastmod>
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<priority>0.8</priority>
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</url>
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<url>
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<loc>http://keep.greums.xyz/#/python/uv-the-python-tool-that-revolutionizes-dependency-management</loc>
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<lastmod>2025-09-27</lastmod>
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<changefreq>monthly</changefreq>
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