### Install Required Python Packages (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Installs all necessary Python libraries listed in the requirements.txt file using the pip package manager. This includes dnspython, aiohttp, and aiodns.

```Bash
pip install -r requirements.txt
```

--------------------------------

### View Command Line Options (Shell)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Displays the full list of available command-line arguments, options, and their descriptions for the subdomain_discovery.py script.

```Shell
usage: subdomain_discovery.py [-h] [-o OUTPUT] [-r RESOLVERS] [-t TIMEOUT]
                              [--http-timeout HTTP_TIMEOUT] [--retries RETRIES]
                              [--user-agent USER_AGENT] [--concurrency CONCURRENCY]
                              domain

Discover subdomains using DNS and crt.sh (async version).

positional arguments:
  domain                The domain to scan.

options:
  -h, --help            show this help message and exit
  -o OUTPUT, --output OUTPUT
                        Output file path (default: <domain>.txt).
  -r RESOLVERS, --resolvers RESOLVERS
                        Comma-separated list of DNS resolvers (default: 8.8.8.8).
  -t TIMEOUT, --timeout TIMEOUT
                        Timeout in seconds for DNS queries (default: 5.0).
  --http-timeout HTTP_TIMEOUT
                        Timeout in seconds for HTTP requests (crt.sh) (default: 10.0).
  --retries RETRIES     Number of retries for HTTP requests (crt.sh) (default: 3).
  --user-agent USER_AGENT
                        User-Agent for HTTP requests. (default: AsyncSubdomainDiscovery/1.0)
  --concurrency CONCURRENCY
                        Max concurrent DNS/HTTP tasks (default: 100).
```

--------------------------------

### Run Script with Default Settings (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Executes the subdomain discovery script for a specified target domain using default settings. Results are automatically saved to a text file named after the domain (e.g., example.com.txt).

```Bash
python subdomain_discovery.py example.com
```

--------------------------------

### Clone Script Repository (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Clones the Subdomain Discovery Script repository from GitHub to your local machine.

```Bash
git clone https://github.com/mazixs/Subdomain-Discovery-Script.git
```

--------------------------------

### Run Script and Save to Custom File (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Runs the script for a domain and directs the output to a user-defined file path instead of the default domain-named file. Use the -o or --output option followed by the desired file name.

```Bash
python subdomain_discovery.py example.com -o my_results.txt
```

--------------------------------

### Run Script with Specific DNS Resolvers (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Executes the script using a custom list of DNS server IP addresses for queries. Provide a comma-separated list of IPs after the -r or --resolvers option.

```Bash
python subdomain_discovery.py example.com -r 8.8.8.8,1.1.1.1
```

--------------------------------

### Navigate to Script Directory (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Changes the current directory in your terminal to the newly cloned repository folder.

```Bash
cd Subdomain-Discovery-Script
```

--------------------------------

### Run Script with Higher Concurrency (Bash)

Source: https://github.com/mazixs/subdomain-discovery-script/blob/main/README.md

Increases the maximum number of simultaneous DNS and HTTP tasks the script will run. This can speed up scanning but may consume more resources. Use the --concurrency option.

```Bash
python subdomain_discovery.py example.com --concurrency 200
```

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