import time

import logging

import sys

def watch_log(log_file, filter_string=""):

"""Watches a log file for changes and prints new entries."""

try:

# Set up the logger

logger = logging.getLogger()

logger.setLevel(logging.DEBUG) # Adjust as needed

# Create a handler to output to the console

handler = logging.StreamHandler(sys.stdout)

formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

handler.setFormatter(formatter)

logger.addHandler(handler)

# Initial state: read all lines from the file

with open(log_file, 'r') as f:

existing_lines = set(f.readlines())

# Watch for changes

while True:

try:

time.sleep(1) # Check for changes every second

with open(log_file, 'r') as f:

current_lines = set(f.readlines())

# Find new lines

new_lines = current_lines - existing_lines

# Print new lines

for line in new_lines:

print(line, end='') # Print without adding extra newline

# Update existing lines

existing_lines = current_lines

except FileNotFoundError:

print(f"Error: Log file '{log_file}' not found.")

break # Exit if the file is not found

except Exception as e:

print(f"An error occurred: {e}")

break

except Exception as e:

print(f"An error occurred: {e}")

if __name__ == "__main__":

if len(sys.argv) != 2:

print("Usage: python watch_log.py <log_file>")

sys.exit(1)

log_file = sys.argv[1]

watch_log(log_file)