Checks and records in a CSV file how many processes with a <process_name> are running every 10 seconds.

process_checker.sh

#!/usr/bin/env python3

import subprocess
import csv
import os
import time
from datetime import datetime
from pathlib import Path

#### Variables definition

home = str(Path.home())
log_file = os.path.join(home, 'logs', 'pid_count.csv')
process = "<process_name>"
header = ['Date', 'Time', 'Count']

### Functions definition
def get_pid(name):
    pid_count = int(subprocess.check_output(["pgrep", "-c", process]).decode('utf8'))
    check_date = datetime.now().strftime('%d-%m-%Y')
    check_time = datetime.now().strftime('%T')
    row = [check_date, check_time, pid_count]
    return row

def header_write(log_file, header):
    with open(log_file, "w") as csvf:
        writer = csv.writer(csvf, delimiter=';')
        writer.writerow(header)

def log_write(log_file, row):
    with open(log_file, "a") as csvf:
        writer = csv.writer(csvf, delimiter=';')
        writer.writerow(row)

### Program execution
header_write(log_file, header)
while True:
    log_write(log_file, get_pid(process))
    time.sleep(10)