Python3 to Merge .txt Files in a Directory

merge.py

import os
import sys

def merge_txt_files(input_dir, output_file):
    """
    Merges all .txt files found in the specified input directory into a single output file.
    
    Parameters:
    - input_dir (str): The directory to search for .txt files.
    - output_file (str): The path to the output file where the merged content will be stored.
    
    Returns:
    - None
    """
    try:
        # Ensure the input directory exists
        if not os.path.isdir(input_dir):
            print(f"The specified input directory does not exist: {input_dir}")
            return
        
        # Find all .txt files in the input directory
        txt_files = [os.path.join(input_dir, f) for f in os.listdir(input_dir) if f.endswith('.txt')]
        
        # Sort files alphabetically to ensure predictable order
        txt_files.sort()
        
        # Merge files
        with open(output_file, 'w') as outfile:
            for file in txt_files:
                with open(file, 'r') as infile:
                    outfile.write(infile.read() + '\n')  # Add a newline between files for clarity
            print(f"All .txt files have been merged into {output_file}")
    
    except Exception as e:
        print(f"An error occurred: {e}")

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: python merge_txt_files.py <input_directory> <output_file>")
        sys.exit(1)
    
    input_dir, output_file = sys.argv[1], sys.argv[2]
    merge_txt_files(input_dir, output_file)