Answer by Bruno Bronosky for Unable to fake terminal input with termios.TIOCSTI

I took the answer from @Ulfalizer and expanded it a bit to be a complete and usable app.

import sysimport fcntlimport termiosimport argparseparser = argparse.ArgumentParser()parser.add_argument('tty', type=argparse.FileType('w'),                    help='full tty path as given by the tty command')group = parser.add_mutually_exclusive_group()group.add_argument('-n', action='store_true',                   help='prevent sending a trailing newline character')group.add_argument('--stdin', action='store_true',                   help='read input from stdin')group = parser.add_argument_group()group.add_argument('cmd', nargs='?',                    help='command to run (required if not using --stdin)')group.add_argument('args', nargs='*',                    help='arguments to command')args = parser.parse_known_args()if args.stdin:    data = sys.stdin.read()else:    data = ''.join([args.cmd] + args.args)for c in data:    fcntl.ioctl(args.tty, termios.TIOCSTI, c)if not args.n and data[-1][-1] != '\n':    fcntl.ioctl(args.tty, termios.TIOCSTI, '\n')

Here is how you use it:

Terminal #1: do...

$ tty > /tmp/t1

Terminal #2: do...

$ sudo python termfake.py $(cat /tmp/t1) date +%s

Terminal #1: observe...

$ tty > /tmp/t1$ date +%s1487276400