subproccess test

t/b.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+
+echo $$ > /var/tmp/surok.spid
+
+while true; do
+	cat txt
+	sleep 2
+done

t/f.py

@@ -0,0 +1,34 @@
+#!/usr/bin/python3
+
+import os
+import subprocess
+from time import sleep
+import sys
+
+
+def child():
+    bashCommand = "./b.sh"
+    process = subprocess.Popen(bashCommand, stdout=sys.stdout)
+    # output = process.communicate()
+
+    return process
+
+
+def parent():
+    newpid = os.fork()
+    if newpid == 0:
+        child()
+    else:
+        pids = (os.getpid(), newpid)
+        print("parent: %d, child: %d\n" % pids)
+
+    c = 0
+    while c < 5:
+        sleep(2)
+        p = open('/var/tmp/surok.spid')
+        cpid = p.read()
+        p.close()
+        print(cpid, c)
+        c = c + 1
+
+parent()

t/txt

@@ -0,0 +1 @@
+OK