Update threader.py

Interlace/lib/threader.py

@@ -1,9 +1,10 @@
 import subprocess
+import os
 from concurrent.futures import ThreadPoolExecutor
 from multiprocessing import Event
-
 from tqdm import tqdm
 
+shell = os.getenv("SHELL") if os.getenv("SHELL") else "/bin/sh"
 
 class Task(object):
     def __init__(self, command):
@@ -49,7 +50,8 @@ class Task(object):
     def _run_task(self, t=False):
         s = subprocess.Popen(self.task, shell=True,
                              stdout=subprocess.PIPE,
-                             encoding="utf-8")
+                             encoding="utf-8",
+                             executable=shell)
         out, _ = s.communicate()
 
         if out != "":