A script to monitor a file's size. Run with `monitor-file-size.py file-to-monitor`.

monitor-file-size.py

#!/usr/bin/env python3
# A script to monitor a file's size.
# Cooper Harasyn, 2018-02-12

import time
import os
import sys

def Main(args):
  if len(args) != 2:
    print("Usage: {} <filename>".format(args[0]))
    return 1
  delay = 1 # second
  path = args[1]
  prevSize = os.path.getsize(path)
  counter = 0
  while counter < 5:
    size = os.path.getsize(path)
    diff = size-prevSize # Bytes
    rate = diff/delay    # Bytes / seconds
    oneM = 1048576
    print("size: {0:10.2f}MB\trate: {1:6.2f}MB/s".format(size/oneM,rate/oneM))
    if diff == 0:
      counter += 1
    else:
      counter = 0
    time.sleep(delay)
    prevSize = size

if __name__ == "__main__":
  sys.exit(Main(sys.argv))