Shell command to write environment key/values as JSON to stdout

envjson.py

#!/usr/bin/env python3
#
# envjson.py
"""
Dumps alphanumerically sorted environment variables to stdout in JSON format.

Usage:
    ./envjson.py  # Replace with the actual script name
"""

import json
import os
import sys
from typing import Literal


def main() -> Literal[0, 1]:
    """Retrieves environment variables and outputs them as formatted JSON.

    Args:
        None

    Returns:
        Literal[0, 1]: 0 on success, 1 on error.
    """
    try:
        # Retrieve environment variables and sort them by their keys
        environ: dict[str, str] = {k: os.environ[k] for k in sorted(os.environ)}
        # Output the environment variables as formatted JSON
        sys.stdout.write(f"{json.dumps(environ, indent=2)}\n")
        return 0

    except Exception as e:
        # Correctly accessing the exception message
        sys.stderr.write(f"Error: {str(e)}\n")
        return 1


if __name__ == "__main__":
    sys.exit(main())