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Automation & scripting

CLI tools, scheduled jobs, filesystem tasks, and glue scripts that save time.

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Automation & scripting easy

How to Tail and Colorize Error Lines in Python

Reads the last N lines of a log file and prints error lines in red using ANSI color codes.

logging terminal colorize
Python 
import sys
import time
from pathlib import Path

def tail_colorize(filename: str, lines: int = 20) -> None:
    """Read last N lines of a file, printing errors in red."""
    path = Path(filename)
    if not path.exists():
        print(f"File '{filename}' not found.", file=sys.stderr)
        return

    # Read last …
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