#!/usr/bin/env python3
"""Line counter utility - counts lines in any text file."""

import sys

def count_lines(filepath):
    with open(filepath, 'r') as f:
        return sum(1 for _ in f)

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("Usage: count_lines.py <filepath>")
        sys.exit(1)
    count = count_lines(sys.argv[1])
    print(f"Line count: {count}")