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CyberBridge Linux Tutorial for Beginners

Introduction

Welcome to this beginner-friendly Linux tutorial, brought to you by CyberBridge! This guide is designed for users who have little to no experience with Linux and want to get started with the basics. We will be working with Ubuntu and macOS.

Table of Contents

  1. Basic Commands
  2. Directory Traversal
  3. Echo and File Manipulation
  4. Text Editing with vi and nano
  5. User and Permissions Management
  6. Installing and Managing Software
  7. Networking Basics
  8. Shell Scripting Introduction
  9. Additional Resources

1. Basic Commands

Before doing anything in Linux, let’s go over a few fundamental commands:

lsb_release -a   # Check which Linux distribution you're using
pwd              # Print current working directory
ls               # List files and directories

Understanding the Linux File System

Linux follows a hierarchical directory structure. Here are some important directories under the root (/):

  • /root – The home directory for the root (admin) user.
  • /home – Contains personal files for all regular users (/home/username).
  • /etc – System configuration files.
  • /bin – Essential binary executables (like ls, pwd).
  • /sbin – System binaries, usually requiring root privileges.
  • /var – Variable data such as logs and temporary files.
  • /usr – Installed user applications and libraries.
  • /tmp – Temporary files, cleared after reboot.

Each user has their own home directory under /home/username, where personal files and configurations are stored.

2. Directory Traversal

To move around in the Linux file system, use the cd (change directory) command:

cd [directory_name]  # Move into a specific directory
cd ..                # Move up one level
cd ../..             # Move up two levels
cd ~                 # Go to your home directory
cd /                 # Move to the root directory

Special Symbols in Linux

  • . (dot) refers to the current directory.
  • .. (double dot) refers to the parent directory.

Example Walkthrough:

pwd       # Shows your current location
ls        # Lists files in the directory
cd /etc   # Move to the /etc directory
pwd       # Check the new location
cd ..     # Move back one directory
cd ~      # Return to your home directory

3. Echo and File Manipulation

Using echo

The echo command prints text to the terminal and can be used to create files:

echo "Hello, Linux!"  # Prints text to the terminal
echo "This is a file" > myfile.txt  # Creates a file with text
cat myfile.txt  # View the file contents

File and Directory Manipulation

touch newfile.txt   # Create an empty file
mkdir myfolder      # Create a new directory
cp file.txt backup/  # Copy a file to a directory
mv file.txt newname.txt  # Rename/move a file
rm file.txt         # Delete a file
rm -r myfolder      # Delete a directory and its contents

Using man (Manual Pages)

To learn more about any command, use man:

man ls  # Opens the manual page for ls

Press q to exit the manual page.

4. Text Editing with vi and nano

vi (obviously the best editor ever, no debate needed)

To open a file in vi:

vi myfile.txt

vi Controls:

  • Press i to enter insert mode and start typing.
  • Press ESC to exit insert mode.
  • Type :wq and press Enter to save and exit.
  • Type :q! to quit without saving (because, obviously, you meant to do that).

nano (the easy way out)

To open a file in nano:

nano myfile.txt

nano Controls:

  • Type freely to edit.
  • CTRL + X to exit.
  • Y to confirm saving changes.
  • Press Enter to save.

5. User and Permissions Management

To check file permissions, use:

ls -l

Example output:

drwxr-xr-x  2 user group 4096 Mar 5 10:00 Documents
-rw-r--r--  1 user group  123 Mar 5 10:01 file.txt

Changing Permissions

chmod 755 filename  # Owner can read/write/execute, others can only read/execute
chmod u+x filename  # Give execute permission to the owner

Changing Ownership

chown user:group filename  # Change the owner and group of a file

6. Installing and Managing Software

Ubuntu uses the apt package manager:

sudo apt update && sudo apt upgrade -y
sudo apt install package_name

macOS uses brew (Homebrew):

brew install package_name

7. Networking Basics

Check network connection:

ping google.com

View IP address:

ip a  # Newer command

8. Shell Scripting Introduction

A simple script:

#!/bin/bash
echo "Hello, Linux!"

Save it as script.sh, then make it executable:

chmod +x script.sh
./script.sh

9. Additional Resources

Congratulations! You now have a solid foundation for working with Linux. Keep practicing and exploring!