Find Binary in a dir of text files Python or Bash

Question

I have a series of log files that are all text.

If a certain error happens it results in binary being inserted in the text.

I want a Python or Bash script that will:

1. Go through the text files (logs) in the dir
2. Show the line that includes the binary
3. Give me the line number where it occurs as well as the file name

Answer 1

Here's what worked for me in Python.

import os
import sys

def main():

  if len(sys.argv) < 2:
    print('Usage: python3 hasbinary.py <DIR>')
    return -1

  DIR = sys.argv[1]

  for file in os.listdir(DIR):
    msgs = []
    if file.endswith('.log'):
      print(f'Reading file {file}.')
      with open(DIR + '/' + file, 'rb') as f:
        msgs = msgs + f.readlines()
      for msg in msgs:
        try:
          msg.decode()
        except:
          print(f'Contains binary data: {msg}')

if __name__ == '__main__':
  main()