<human>:  3 read first line of file.
<bot>: Here is a Python program to read the first line of file

import os

def read_first_line(filename):
    """
    Read the first line of a file.

    :param filename: The name of the file.
    :return: The first line of the file.
    """
    with open(filename, 'r') as f:
      return f.readline()

# Enter the filename
filename = "test.txt"

# Calling the function
print((read_first_line(filename)))

#Example Output
# 

#Remember to inspect code for bugs.