What's the One Script You Wrote That You Still Use Every Day?

I'll go first. Three years ago I wrote a 20-line Python script that watches a folder for new CSV files, deduplicates them, and moves the clean version to Dropbox. I wrote it in 15 minutes. It has saved me roughly 200 hours since then. import time from pathlib import Path import pandas as pd import shutil watch = Path ( ' ~/Downloads ' ). expanduser () done = Path ( ' ~/Dropbox/clean-data ' ). expanduser () done . mkdir ( exist_ok = True ) seen = set () while True : for f in watch . glob ( ' *.csv ' ): if f . name not in seen : df = pd . read_csv ( f ). drop_duplicates () df . to_csv ( done / f . name , index = False ) seen . add ( f . name ) print ( f ' Cleaned: { f . name } ( { len ( df ) } rows) ' ) time . sleep ( 10 ) It's ugly. It's not production-grade. But it runs every single day and I've never had to touch it. What's yours? I'm collecting the best ones for a roundup post. The most interesting scripts I'll feature (with credit) in a follow-up article. Rules: Any language Must be