feat: create starter audit script

Author: HaoLiHaiO

.gitignore

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+*.log

README.md

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+# Basic Linux audit script
+
+## How to run
+
+```sh
+chmod +x sys-audit.sh
+./sys-audit.sh
+```

sys-audit.sh

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+#!/bin/bash
+
+# Define output file
+OUTPUT_FILE="system_audit_$(date +%Y%m%d_%H%M%S).log"
+
+echo "Starting System Audit..." | tee -a $OUTPUT_FILE
+
+# System Information
+echo "Gathering System Information..." | tee -a $OUTPUT_FILE
+hostname | tee -a $OUTPUT_FILE
+uname -a | tee -a $OUTPUT_FILE
+cat /etc/os-release | tee -a $OUTPUT_FILE
+
+# Disk Usage
+echo "Checking Disk Usage..." | tee -a $OUTPUT_FILE
+df -h | tee -a $OUTPUT_FILE
+
+# Packages
+echo "Listing Installed Packages..." | tee -a $OUTPUT_FILE
+
+detect_package_manager() {
+    if command -v dpkg &> /dev/null; then
+        echo "dpkg"
+    elif command -v pacman &> /dev/null; then
+        echo "pacman"
+    elif command -v rpm &> /dev/null; then
+        echo "rpm"
+    else
+        echo "unknown"
+    fi
+}
+
+PACKAGE_MANAGER=$(detect_package_manager)
+
+case $PACKAGE_MANAGER in
+    dpkg)
+        dpkg -l | tee -a $OUTPUT_FILE
+        ;;
+    pacman)
+        pacman -Q | tee -a $OUTPUT_FILE
+        ;;
+    rpm)
+        rpm -qa | tee -a $OUTPUT_FILE
+        ;;
+    *)
+        echo "Unsupported package manager" | tee -a $OUTPUT_FILE
+        ;;
+esac
+
+# Network Information
+echo "Gathering Network Information..." | tee -a $OUTPUT_FILE
+ip address | tee -a $OUTPUT_FILE
+ss -plants | tee -a $OUTPUT_FILE
+
+# Open Ports
+echo "Checking Open Ports..." | tee -a $OUTPUT_FILE
+lsof -i -P -n | grep LISTEN | tee -a $OUTPUT_FILE
+
+# Active Connections
+echo "Listing Active Connections..." | tee -a $OUTPUT_FILE
+ss -tunap | tee -a $OUTPUT_FILE
+
+# Users and Groups
+echo "Listing Users and Groups..." | tee -a $OUTPUT_FILE
+cat /etc/passwd | tee -a $OUTPUT_FILE
+cat /etc/group | tee -a $OUTPUT_FILE
+
+# Scheduled Tasks
+echo "Listing Scheduled Tasks..." | tee -a $OUTPUT_FILE
+crontab -l | tee -a $OUTPUT_FILE
+ls /etc/cron.* | tee -a $OUTPUT_FILE
+
+# File System Tree
+echo "Generating File System Tree..." | tee -a $OUTPUT_FILE
+tree / -L 2 | tee -a $OUTPUT_FILE
+
+echo "System Audit Completed. Results saved in $OUTPUT_FILE"