RosettaCodeData/Task/Take-notes-on-the-command-line/Python/take-notes-on-the-command-line.py

import sys, datetime, shutil

if len(sys.argv) == 1:
    try:
        with open('notes.txt', 'r') as f:
            shutil.copyfileobj(f, sys.stdout)
    except IOError:
        pass
else:
    with open('notes.txt', 'a') as f:
        f.write(datetime.datetime.now().isoformat() + '\n')
        f.write("\t%s\n" % ' '.join(sys.argv[1:]))