Run Sublist3r for the a domain from list of domains.txt and wait for it to finish, then run the next one. Append results to final output subdomaints.txt file with domain header

bulk-sublister.py

#!/bin/bash

INPUT_FILE="domains.txt"
OUTPUT_FILE="all_subdomains.txt"

# Clear or create output file
> "$OUTPUT_FILE"

while read -r domain; do
    if [[ -n "$domain" ]]; then
        echo "[*] Enumerating subdomains for: $domain"
        TEMP_FILE="${domain}_subs.txt"
        
        # Run Sublist3r for the domain and wait for it to finish
        sublist3r -d "$domain" -o "$TEMP_FILE"
        
        # Append results to final output with domain header
        echo "### $domain" >> "$OUTPUT_FILE"
        cat "$TEMP_FILE" >> "$OUTPUT_FILE"
        echo -e "\n" >> "$OUTPUT_FILE"
        
        # Optional: remove temp file
        rm -f "$TEMP_FILE"
    fi
done < "$INPUT_FILE"