Send and Read Message in a Python Process Via stdin in GNU/Linux

send-read-message.md

To read message from stdin try this sample code:

import time
import sys

while True:
    for i in sys.stdin:
        print(i)
    time.sleep(2)

Run it via python command:

$ python sample.py

To send message to this ran process try to find its PID:

$ pidof python sample.py
8184

Then send message to the stdin of process via below command:

$ echo "Hello World!" > /proc/8184/fd/0

Or to mix 2 last steps, try it:

$ echo "Hello World!" > /proc/$(pidof python sample.py)/fd/0

Reference: https://serverfault.com/questions/178457/can-i-send-some-text-to-the-stdin-of-an-active-process-running-in-a-screen-sessi