🔐 Linux Networking & Security

Bash Scripts Collection

A collection of Bash scripts for practicing Linux networking, system administration, and cybersecurity fundamentals. Built for students, beginners, and security enthusiasts who learn by doing.

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📑 Table of Contents

• 📂 Repository Structure
• 📜 Scripts Overview
  • 1. Basic Commands & Conditions
  • 2. Networking Information Script
  • 3. Port Monitoring Script
  • 4. Practice & System Info Script
• 🚀 How to Use
• ⚡ Requirements
• 📚 Learning Outcomes
• 🛠️ Author

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📂 Repository Structure

/Network$ tree -L 2
.
├── 📄 Quick_ping.sh
├── 📄 README.md
├── 📄 network_diagnostics.sh
├── 📄 new.sh
├── 📄 port.sh
├── 📄 practice.sh
├── 📄 save.sh
└── 📄 test.sh

0 directories, 8 files

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📜 Scripts Overview

1. 🖥️ Basic Commands & Conditions

File: new.sh / test.sh

# What this script does:
✦  Prints user details     →  whoami, pwd, date
✦  Creates directories     →  mkdir, touch
✦  Loops & conditions      →  for loops, if-else
✦  User input handling     →  read commands

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2. 🌐 Networking Information Script

File: network_diagnostics.sh

# What this script does:
✦  Listening ports         →  ss -tuln
✦  Active processes        →  netstat, ip a
✦  System info             →  Hostname, Gateway, DNS, MAC
✦  ARP table               →  arp -a
✦  Connectivity tests      →  ping, traceroute, nslookup
✦  DNS cache flush         →  systemd-resolve --flush-caches

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3. 🔍 Port Monitoring Script

File: port.sh

# What this script does:
✦  TCP/UDP ports           →  ss -tuln (modern netstat)
✦  Raw socket info         →  ss -a
✦  Open port count         →  grep + wc -l
✦  Process per port        →  ss -tulnp
✦  Active connections      →  ss -s

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4. 🛠️ Practice & System Info Script

File: practice.sh

# What this script does:
✦  IP & Gateway            →  ip route, ip addr
✦  Open ports              →  ss -tuln
✦  Traceroute              →  traceroute 8.8.8.8
✦  IP range scanner        →  loop-based ping sweep
✦  User input              →  read name/age prompts
✦  Active connections      →  ss -s

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🚀 How to Use

Step 1 — Clone the Repository

git clone https://github.com/Unixxxxxx/linux-networking-scripts.git
cd linux-networking-scripts

Step 2 — Give Execute Permission

chmod +x script_name.sh

Step 3 — Run Any Script

./network_diagnostics.sh
./port.sh
./practice.sh
./Quick_ping.sh

Step 4 — Run with sudo (if needed)

sudo ./port.sh        # for process-level port info
sudo ./network_diagnostics.sh

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⚡ Requirements

🖥️ System ✦ Linux OS (Ubuntu / Debian / Fedora) ✦ Bash shell (v4.0+) ✦ Terminal with sudo access

🔧 Tools Required ✦ ss → socket statistics ✦ netstat → network connections ✦ ip → IP/route management ✦ ping → connectivity test ✦ traceroute → route tracing ✦ nslookup → DNS lookup

Install missing tools:

# Ubuntu / Debian
sudo apt install net-tools iproute2 iputils-ping traceroute dnsutils -y

# Fedora / CentOS
sudo dnf install net-tools iproute iputils traceroute bind-utils -y

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📚 Learning Outcomes

🌐 Networking TCP/IP Basics Port Analysis DNS & Routing ARP Protocol

🔐 Security Port Scanning Process Recon Active Connections Network Hardening

🐧 Linux Bash Scripting System Commands File Operations User Input/Output

⚙️ Automation Shell Scripting Loop Automation Scheduled Tasks System Monitoring

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🛠️ Author

Sudhanshu Kumar

🛡️ Cybersecurity Enthusiast  |  💻 Python & Bash Developer  |  🐧 Linux Lover

"In God we trust. All others we monitor." 🔐

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