Reference library

Automation & scripting

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

4 matches

Automatically Generate Charts from CSV Files with One Command

Read a CSV file with headers, extract the first two numeric columns, and save a matplotlib line chart as a PNG image.

import csv
import sys
from pathlib import Path
import matplotlib.pyplot as plt

def generate_chart(csv_path: str) -> None:
    """Read a CSV file with headers and plot the first two numeric columns."""
    data = []
    with open(csv_path, 'r', newline='') as f:
        reader = csv.reader(f)
        headers = next(re…

65 0 Open

Automation & scripting medium

Find Zombie Processes on Linux with Python

Parse the output of `ps -eo pid,stat,comm` to detect processes in zombie state (Z) on a Linux system and report their PIDs and commands.

linux process monitoring

Python

#!/usr/bin/env python3
import os
import subprocess

def find_zombie_processes():
    """Find zombie processes (state 'Z') running on Linux."""
    try:
        result = subprocess.run(['ps', '-eo', 'pid,stat,comm'], capture_output=True, text=True, check=True)
        zombies = []
        for line in result.stdout.stri…

38 0 Open

Automation & scripting medium

How to Monitor USB Device Connections in Python

A Python utility that monitors USB device connections and disconnections by comparing output of the lsusb command at regular intervals.

usb monitoring subprocess

Python

import time
import subprocess
import os

def get_usb_devices():
    """Return list of currently connected USB devices (Linux)."""
    try:
        result = subprocess.run(['lsusb'], capture_output=True, text=True, check=True)
        return result.stdout.strip().split('\n')
    except (subprocess.CalledProcessError, F…

43 0 Open

Automation & scripting medium

How to Run Tesseract OCR from Python with subprocess

This script uses Python's subprocess module to invoke the Tesseract OCR engine from the command line and return the extracted text.

subprocess ocr tesseract

Python

import subprocess

def ocr_image(image_path):
    command = ["tesseract", image_path, "stdout"]
    result = subprocess.run(command, capture_output=True, text=True)
    return result.stdout.strip()

if __name__ == "__main__":
    # Stub: call the actual tesseract (must be installed)
    text = ocr_image("sample.png")
…

13 0 Open

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