Learning Linux Commands in a Docker Environment

Introduction

• Transform your terminal skills into a superpower.
• Learn by doing: Follow along with Linux commands.
• Use Docker to set up a Linux environment on Mac or Windows.

Setting Up Docker

1. Download Docker Desktop
   • Available for Windows or Mac.
   • No prior knowledge of Docker needed.
2. Run Docker Image
   • Download a custom Linux Docker image (link provided in the video description).
   • Execute the command to fetch and run the image as a container.

Basic Linux Commands

Validate Linux Environment

• Command: uname
  • Checks and displays the operating system name.

Navigating the File System

• Current Directory: PWD (Print Working Directory)
  • Shows current directory path.
• Change Directory: CD [directory]
  • Navigate to desired directory, e.g., /var/log/application.

Listing Files

• List Files: LS
  • Displays files and directories in current directory.
• Extended File Info: LS -L
  • Shows detailed file info including size and permissions.

Viewing and Manipulating Files

• View File Content: cat [file]
  • Outputs contents of a file.
• Filter Content: grep [pattern]
  • Filters lines containing specific words or phrases.
  • Use pipe | to chain commands.
• Save Output to File: > [output-file]
  • Redirects and saves command output to a file.

File Operations

• Copy Files: CP [source] [destination]
  • Copies files to a new location.
• Count Specific Lines: grep [pattern] | wc -l
  • Counts lines containing specific pattern.

Debugging and Configuration

Identifying Configuration Issues

• Search Configuration Files: find [directory] -name "*.conf"
  • Finds configuration files across directories.
• Compare Files: diff [file1] [file2]
  • Shows differences between two files.*

Networking and Service Checks

• Check Service Accessibility: curl -I [url]
  • Checks if a service is running on a specific port.

Editing Files

• Edit Files with Vim: vim [file]
  • Command line text editor; use i for edit mode, esc for navigation.
• Change File Permissions: chmod [permissions] [file]
  • Modify file permissions (e.g., chmod 666 for read/write).

Wrapping Up

• Exit Docker Container: exit
  • Returns to the host operating system terminal.

Conclusion

• Using Linux commands enhances troubleshooting and operational efficiency.
• Commands allow file navigation, editing, permission changes, and more.
• Share the knowledge with others who might benefit.

Feel free to share the video with friends or colleagues to help them master Linux command-line skills.