https://github.com/londheshubham153/shell-scripting-for-devops

https://github.com/londheshubham153/shell-scripting-for-devops

Last synced: 7 months ago
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• Host: GitHub
• URL: https://github.com/londheshubham153/shell-scripting-for-devops
• Owner: LondheShubham153
• Created: 2024-02-02T11:57:54.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2025-02-11T16:09:32.000Z (9 months ago)
• Last Synced: 2025-04-12T01:03:44.058Z (7 months ago)
• Language: Shell
• Size: 7.81 KB
• Stars: 68
• Watchers: 3
• Forks: 440
• Open Issues: 6
• Metadata Files:
  • Readme: README.md

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README

          
# Shell Scripting in One Shot – Comprehensive Guide for DevOps

## 1. Introduction to Shell and Environment Setup

- What is Shell? (Bash, Zsh, Ksh, etc.)

- Shell vs. Terminal vs. Bash

- Installing and Setting Up Bash (Linux/macOS/WSL for Windows)

- Essential Configuration Files (`~/.bashrc`, `~/.bash_profile`, `~/.zshrc`)

- Setting Up a DevOps-Friendly Shell Environment  

  - PS1 Prompt Customization  

  - Useful Aliases and Functions  

  - Environment Variables (`$PATH`, `$HOME`, `$USER`)  

## 2. Basic Scripting Skills

- Writing Your First Shell Script (`.sh` file, shebang `#!/bin/bash`)

- Executing Scripts (`chmod +x script.sh`, `./script.sh`, `bash script.sh`)

- Variables and Data Types (String, Integer, Arrays)

- Reading User Input (`read` command)

- Basic Operators (Arithmetic, Relational, Logical)

- Control Flow:

  - Conditional Statements (`if-else`, `case`)

  - Looping (`for`, `while`, `until`)

- Functions in Shell Scripts  

- Exit Codes and Status (`$?`, `exit` command)

## 3. Intermediate Scripting Techniques

- Working with Files and Directories (`ls`, `cp`, `mv`, `rm`, `mkdir`, `find`)

- String Manipulation (`sed`, `awk`, `cut`, `tr`)

- File Permissions and Ownership (`chmod`, `chown`, `umask`)

- Input and Output Redirection (`>`, `>>`, `<`, `2>`, `&>`)

- Process Management (`ps`, `top`, `kill`, `nohup`, `&`, `jobs`, `fg`, `bg`)

- Cron Jobs and Task Automation (`crontab -e`, `at`, `systemd timers`)

- Working with Logs (`tail -f`, `grep`, `awk` for parsing logs)

## 4. Advanced Scripting and Debugging

- Writing Robust Scripts with Error Handling (`set -e`, `trap`, `||`, `&&`)

- Debugging Techniques (`bash -x script.sh`, `set -x`, `set -v`)

- Regular Expressions and Pattern Matching (`grep -E`, `sed -r`)

- Advanced File Processing (`awk`, `sed`, `xargs`, `cut`, `paste`)

- Networking with Shell Scripts (`ping`, `curl`, `wget`, `netstat`, `ss`)

- Parallel Execution and Background Jobs (`&`, `wait`, `xargs -P`)

- Working with APIs in Shell Scripts (cURL for REST API calls)

- Secure Shell Scripting (`ssh`, `scp`, `sftp`, `expect`)

## 5. Real-World Applications and Integration

- Shell Scripting in DevOps Pipelines (CI/CD Integration)

- Automating AWS/GCP/Azure Operations (`aws-cli`, `gcloud`, `az-cli`)

- Automating Kubernetes Tasks (`kubectl`, `helm`, `jq`, `yq`)

- Writing System Health Checks & Monitoring Scripts

- Backup and Restore Automation

- Log Parsing and Analysis with Shell Scripting

## 6. Shell Mastery and Continuous Learning

- Writing Modular & Reusable Shell Scripts  

- Best Practices for Readable and Maintainable Shell Scripts  

- Shell Scripting Performance Optimization  

- Learning Alternative Shells (Zsh, Fish, Dash)  

- Moving Beyond Shell: When to Use Python, Ansible, or Terraform  

- Keeping Up with DevOps Industry Trends  

## 7. Projects to Keep Up with the Industry

- **Automated Log Monitoring & Alert System**

  - Parses logs, filters errors, and sends alerts via email or Slack.

- **Infrastructure Backup Automation**

  - Automates backup of critical files, databases, or VM snapshots.

- **CI/CD Pipeline Helper**

  - Automates repository cloning, testing, and deployment tasks.

- **System Health Check Script**

  - Checks CPU, Memory, Disk Usage, Running Services, and Network Status.

- **Kubernetes Resource Monitor**

  - Automates collection of Kubernetes cluster metrics for monitoring.

- **AWS Instance Management Script**

  - Starts/stops AWS EC2 instances on demand or based on schedule.