Permissions in Linux

1. What to use Permissions for?
Permission is what user, group can do with file, fold

2. How to use Permissions?

Concepts about permission

- 04 types of permissions: rwx- : read (r), write (w), and execute (x), - (none)
- 03 types of who has permissions: Owner, Group, Others 
- 02 types of representations permission:
+ Octal Representation: Read (4) Write (2) Execute (1) => 644 means:
/ Owner can read (4) + write (2)
/ Group can read (4)
/ Others can read (4)
+ Symbolic Representation: r: Read; w: Write; x: Execute; d: Directory; -: Regular file; s: Setuid or setgid; t: Sticky bit; => drwxr-xr-- means:
/ Owner can read, write, and execute (rwxz
/ Group can read, execute, not write (r-x).
/ Others can rad, not write & execute (r--)

Managing Users and Groups

- To manage users: useradd, usermod, userdel
- To manage groups: groupadd, groupmod, groupdel.

Managing Permission for Uses and Groups

- To change the access permissions of files and directories using: chmod
- To change the ownership of files and directories using: chown

Sudo permission

- To allows users to execute commands with the privileges of another user (usually the system administrator) using: sudo
- Edit the /etc/sudoers file to configure sudo access rights (sudo nano /etc/sudoers)

3. What does Permissions include? 

--------------------------
Detailed instructions

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Linux tutorial from basic to advanced

1. Introduction to Linux:
What is Linux?
History and distributions.
Basic Linux concepts: Kernel, Shell, Filesystem, Processes.
2. Getting Started:
Installation of a Linux distribution (e.g., Ubuntu, CentOS).
Basic command-line navigation and usage.
Filesystem hierarchy.
3. Working with the Shell:
Understanding shells (Bash, Zsh, etc.).
Shell scripting basics.
4. User and Permissions:
User management (add, modify, delete users) & File permissions and ownership.
Access Control Lists (ACLs).
5. System Administration Basics:
Package management (apt, yum, etc.).
Service management (systemd, init.d).
Basic networking commands (ifconfig, ping, netstat).
System monitoring (top, ps, htop).
6. Advanced Filesystem Management:
Disk management (fdisk, parted).
Filesystem management (mkfs, mount, fsck).
Logical Volume Management (LVM).
7. Shell Scripting:
Writing and executing shell scripts.
Control structures (if statements, loops).
Functions and arguments.
8. Network Configuration and Services:
Configuring network interfaces (ifconfig, ip).
DNS configuration (resolv.conf).
Setting up basic network services (SSH, FTP, Apache, Nginx).
9. Security and Permissions:
Firewall configuration (iptables, firewalld).
Security best practices.
Filesystem encryption (LUKS).
10. System Monitoring and Performance Tuning:
Performance monitoring (vmstat, iostat).
Process management (kill, nice, renice).
Resource usage optimization.
11. Advanced System Administration:
Advanced package management (aptitude, yum-utils).
Automating tasks with cron jobs.
System backups and recovery.
12. Virtualization and Containers:
Introduction to virtualization (VirtualBox, VMware).
Introduction to containerization (Docker, Kubernetes).
13. Advanced Shell Scripting:
Advanced scripting techniques.
Error handling and debugging.
Script optimization.
14. High Availability and Clustering:
Introduction to HA concepts.
Setting up a basic cluster (Pacemaker, Corosync).
15. System Security:
Intrusion Detection Systems (IDS).
System hardening.
Penetration testing basics.
16. Cloud Computing and DevOps:
Introduction to cloud computing (AWS, GCP, Azure).
Basics of DevOps practices and tools.
17. Advanced Networking:
Virtual Private Networks (VPN).
Network troubleshooting tools (tcpdump, wireshark).
Advanced routing and VLANs.
18. Linux Kernel Internals:
Understanding the Linux kernel.
Kernel modules and device drivers.
19. Certification and Career Advancement:
Linux certification paths (e.g., CompTIA Linux+, RHCSA, RHCE).
Job roles and opportunities for Linux professionals.
20. Continuous Learning and Resources:
Keeping up-to-date with Linux advancements.
Online communities, forums, and resources.
Books, tutorials, and courses.

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Jenkins tutorial from basic to advanced

1. Outline learning jenkins
- Jenkins
- Jobs, Builds & Triggers
- Builds
- Pipelines & Jenkinsfile
- Views
- Master server
- Agents (Nodes/Slaves)
- Plugins
- Credentials
- Parameters
- SCM (Source code management)
- Ngrok
- Python Jenkins (automated for Jenkins)
- Laravel CI/CD with Jenkins, Docker, AWS
- Implementing CI/CD for a Laravel App with Jenkins Using Docker Cloud Agents

2. What to use Jenkins for?
- Jenkins is used for CI/CD (continuous integration/ continuous delivery)
+ Automated builds
+ Continuous integration (CI)
+ Automated testing
+ Continuous Deployment (CD)  
+ Monitoring and reporting

- Jenkins Infrastructure:
+ Master server: Controls pipelines, Schedules Builds
+ Agents: Perform the Build

- Workflow in Jenkins:
+ Developer: commit the code
+ Jenkins Master server: aware the commit change code, then Triggers Pipeline, and distribute to a Agents to run (The Agent was selected base on Configure Labels)
+ Agents run the build: Build, test, distribute code to Server to deploy.

3. How to use Jenkins?
- Installation
- Accessing Jenkins
- Creating Jobs
- Building Jobs
- View Build results
- Monitoring and maintenance
- Scaling and Optimization
- Continuous integration and Deployment

Reference
- https://www.jenkins.io/doc/tutorials/
- https://www.tutorialspoint.com/jenkins/index.htm

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Data structures and algorithms tutorial from basic to advanced

Introduction to Data Structures and Algorithms:
Overview of data structures and algorithms
Importance and applications in programming
Understanding time and space complexity
Basic Data Structures:
Arrays and dynamic arrays
Linked lists (singly linked, doubly linked)
Stacks and queues
Hash tables and hash maps
Basic Algorithms:
Searching algorithms (linear search, binary search)
Sorting algorithms (bubble sort, selection sort, insertion sort)
Recursion and recursive algorithms
Advanced Data Structures:
Trees (binary trees, binary search trees, AVL trees, B-trees)
Heaps (binary heaps, priority queues)
Graphs (undirected, directed, weighted, unweighted)
Advanced Algorithms:
Advanced searching algorithms (binary search trees, depth-first search, breadth-first search)
Advanced sorting algorithms (merge sort, quick sort, heap sort)
Dynamic programming and memoization
Greedy algorithms
String Algorithms:
String searching algorithms (Naive string matching, Knuth-Morris-Pratt algorithm)
String manipulation and matching algorithms
Regular expressions and pattern matching
Graph Algorithms:
Shortest path algorithms (Dijkstra's algorithm, Bellman-Ford algorithm)
Minimum spanning tree algorithms (Prim's algorithm, Kruskal's algorithm)
Topological sorting
Graph traversal algorithms (DFS, BFS)
Advanced Topics:
Advanced data structures (trie, Fenwick tree, segment tree)
Approximation algorithms
Network flow algorithms (Ford-Fulkerson algorithm, Edmonds-Karp algorithm)
NP-complete problems and approximation algorithms
Algorithm Analysis and Optimization:
Analyzing algorithm complexity (time complexity, space complexity)
Big O notation and asymptotic analysis
Optimizing algorithms (loop unrolling, caching, memoization)
Practical Applications:
Solving coding interview problems
Algorithmic problem-solving techniques
Real-world examples and case studies
Implementing algorithms in programming languages like Python, Java, C++
Data Structures and Algorithms in Practice:
Using data structures and algorithms in software development projects
Design patterns and algorithmic approaches
Code optimization and best practices
Tools and libraries for implementing data structures and algorithms

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Git tutorial from basic to advanced

Git Basics:
Introduction to version control and Git
Installing Git and configuring user settings
Initializing a Git repository (git init)
Basic Git commands: git add, git commit, git status, git log
Working with Branches:
Understanding branches in Git
Creating and switching branches (git branch, git checkout)
Merging branches (git merge)
Resolving merge conflicts
Collaborating with Remotes:
Adding remote repositories (git remote add)
Cloning remote repositories (git clone)
Fetching and pulling changes from remote (git fetch, git pull)
Pushing changes to remote (git push)
Collaborative workflows (Forking, Pull Requests)
Advanced Branching and Merging:
Branching strategies (Feature branching, Gitflow)
Rebasing branches (git rebase)
Interactive rebase (git rebase -i)
Cherry-picking commits (git cherry-pick)
Git Tools and Customization:
Git aliases for custom commands
Configuring Git settings globally and per repository
Git GUI tools and IDE integrations
Rewriting History:
Amending commits (git commit --amend)
Squashing commits (git rebase -i)
Rewriting commit history (git rebase -i, git filter-branch)
Advanced Collaboration:
Collaborating with multiple remotes
Submodules and subtrees
Git hooks for automating tasks
Managing large repositories with Git LFS (Large File Storage)
Git Internals:
Understanding Git objects (blobs, trees, commits)
Git references and the reflog
Exploring Git repository structure
Git Workflow Best Practices:
Commit message conventions
Code review best practices
Continuous Integration and Deployment (CI/CD) with Git
Troubleshooting and Recovery:
Undoing changes (git checkout, git reset)
Recovering lost commits (git reflog)
Restoring deleted branches or commits
Git in Real-World Scenarios:
Git branching and merging strategies in a team environment
Handling project dependencies with Git submodules
Versioning configuration files and environments
Git Security and Access Control:
Securing Git repositories (SSH, HTTPS, authentication)
Access control with Git hosting platforms (GitHub, GitLab, Bitbucket)
Git security best practices and avoiding common pitfalls

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Vuejs tutorial from basic to advanced

Vue.js Basics:
Introduction to Vue.js and its core concepts
Setting up a Vue.js development environment
Vue CLI and project scaffolding
Vue components and component-based architecture
Template syntax and directives
Data binding and interpolation
Vue.js Instance and Lifecycle Hooks:
Creating Vue instances
Lifecycle hooks and their usage
Mounting, updating, and destroying lifecycle phases
Understanding reactivity in Vue.js
Vue Router and Routing:
Installing and configuring Vue Router
Basic routing with Vue Router
Nested routes and route parameters
Programmatic navigation
Route guards and navigation guards
State Management with Vuex:
Introduction to Vuex for state management
Setting up Vuex store and modules
Mutations, actions, and getters
Integrating Vuex with Vue components
Managing complex application state with Vuex
Forms and Form Handling:
Handling form submission and form validation in Vue.js
Two-way data binding with v-model directive
Form libraries in Vue.js (Vuelidate, VeeValidate)
Custom form validation and error handling
Vue Directives and Components:
Built-in directives in Vue.js (v-if, v-for, v-bind, v-on, etc.)
Creating custom directives in Vue.js
Understanding Vue components and component lifecycle
Props and custom events in Vue components
Global vs. local component registration
Advanced Component Patterns:
Slot content distribution and named slots
Scoped slots for flexible component composition
Dynamic components and component switching
Higher-Order Components (HOCs) in Vue.js
Render functions and JSX in Vue.js
Advanced Topics:
Server-side rendering with Vue.js (Nuxt.js)
Vue.js performance optimization techniques
Error handling and debugging in Vue.js applications
Testing Vue.js components (unit testing and integration testing)
Optimistic UI updates and handling asynchronous actions
Real-World Application Development:
Building a CRUD application with Vue.js and RESTful APIs
Integrating third-party APIs and libraries into Vue.js applications
Authentication and authorization in Vue.js applications
Deploying Vue.js applications to production environments
Bonus Topics:
Vue.js animations and transitions
Internationalization (i18n) in Vue.js applications
Progressive Web App (PWA) development with Vue.js
Vue.js with TypeScript integration

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Reactjs tutorial from basic to advanced

React Basics:
Introduction to React and its features
Setting up a React development environment
JSX syntax and components
State and props
Handling events in React
Rendering lists and conditional content
React Router and Routing:
Installing and configuring React Router
Basic routing with React Router
Nested routes and route parameters
Programmatic navigation
Route guards and authentication
Managing State in React:
State management approaches in React (useState, useContext, Redux)
Using useState hook for local component state
Context API for managing global state
Introduction to Redux for centralized state management
Integrating Redux with React components
React Hooks:
Understanding React Hooks and their purpose
Using useState, useEffect, useContext, and custom hooks
Writing custom hooks for reusable logic
Rules of Hooks and best practices
Migrating class components to functional components with hooks
Forms and Form Handling:
Controlled vs. uncontrolled components
Handling form submission and form validation
Form libraries in React (Formik, React Hook Form)
Managing complex form state
React Context and useContext:
Using Context API for state management
Creating and consuming context in React components
Prop drilling problem and useContext hook
Context for theme switching and authentication
React Component Patterns:
Higher-Order Components (HOCs)
Render Props pattern
Compound Components
Presentational and Container components
React patterns for better code organization and reusability

Advanced Topics:
Server-side rendering with React (Next.js)
React performance optimization techniques
Error handling and debugging in React applications
Testing React components (unit testing and integration testing)
Optimistic UI updates and handling asynchronous actions
Real-World Application Development:
Building a CRUD application with React and RESTful APIs
Integrating third-party APIs and libraries into React applications
Authentication and authorization in React applications
Deploying React applications to production environments
Bonus Topics:
Introduction to TypeScript with React
React Native for mobile application development
GraphQL integration with React applications
Webpack configuration for React projects

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