Answer by Avinash Raj for multiple file rename based on modification date

Through python,

script.py

import os
import shutil
directory = sys.argv[1]
count = '0'
for item in os.listdir(directory):
    count = str(int(count)+1)
    newname = re.sub(r'.*', count+'.txt', item)
    shutil.move(directory+"/"+item, directory+"/"+newname)

How to run?

python3 script.py /path/to/the/directory