2025-09-15 12:32:02 +02:00
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+# getIps.sh
+
+A bash script that resolves hostnames to their IPv4 and IPv6 addresses using DNS lookups.
+
+## Description
+
+This script reads a list of hostnames from an input file and performs DNS lookups to find their corresponding IPv4 and IPv6 addresses. The results are written to an output file in a tab-separated format.
+
+## Usage
+
+```bash
+./getIps.sh <input_file> <output_file>
+```
+
+### Arguments
+
+- `input_file`: Path to a text file containing hostnames (one per line)
+- `output_file`: Path where the results will be written
+
+### Example
+
+```bash
+./getIps.sh hosts.txt results.txt
+```
+
+## Input Format
+
+The input file should contain hostnames, one per line:
+
+```
+google.com
+github.com
+stackoverflow.com
+```
+
+## Output Format
+
+The output file will contain tab-separated values with the following columns:
+
+```
+hostname    IPv4_address    IPv6_address
+```
+
+Example output:
+```
+google.com    142.250.191.14    2a00:1450:4001:80e::200e
+github.com    140.82.112.4      N/A
+stackoverflow.com    151.101.1.69    N/A
+```
+
+## Features
+
+- Resolves both IPv4 (A records) and IPv6 (AAAA records) addresses
+- Handles empty lines in input file gracefully
+- Shows "N/A" for addresses that cannot be resolved
+- Clears previous output file before writing new results
+- Provides usage information if incorrect arguments are provided
+
+## Requirements
+
+- `dig` command (part of dnsutils package)
+- Bash shell
+
+## Installation
+
+Make the script executable:
+
+```bash
+chmod +x getIps.sh
+```
+
+## Error Handling
+
+- The script will exit with an error if the wrong number of arguments is provided
+- Empty lines in the input file are automatically skipped
+- DNS resolution failures are handled gracefully (shows "N/A")
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+#!/bin/bash
+
+# Check if required arguments are provided
+if [ $# -ne 2 ]; then
+    echo "Usage: $0 <input_file> <output_file>"
+    echo "Example: $0 hosts.txt output.txt"
+    exit 1
+fi
+
+# Input and output files from command line arguments
+INPUT_FILE="$1"
+OUTPUT_FILE="$2"
+
+# Clear previous output
+> "$OUTPUT_FILE"
+
+# Process each hostname
+while read -r host; do
+    # Skip empty lines
+    [[ -z "$host" ]] && continue
+
+    ipv4=$(dig +short A "$host" | head -n 1)
+    ipv6=$(dig +short AAAA "$host" | head -n 1)
+
+    echo -e "$host\t${ipv4:-N/A}\t${ipv6:-N/A}" >> "$OUTPUT_FILE"
+done < "$INPUT_FILE"
+
+echo "Done. Results written to $OUTPUT_FILE"