brock@montreat:~/csci373$ python
Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) 
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> subprocess.call(['ls', '/home/brock/csci373'])
code-examples	 index.shtml	     lectures-new.shtml~  sched.h
commonnav.html	 labs		     lectures.shtml	  stuff
commonnav.html~  lectures-new.shtml  lectures.shtml~	  syllabus.shtml
0
>>> p = subprocess.Popen(['ls', '/home/brock/csci373'], stdout=subprocess.PIPE)
>>> print p.communicate()
('code-examples\ncommonnav.html\ncommonnav.html~\nindex.shtml\nlabs\nlectures-new.shtml\nlectures-new.shtml~\nlectures.shtml\nlectures.shtml~\nsched.h\nstuff\nsyllabus.shtml\n', None)
>>> p.exit()
>>> p = subprocess.Popen(['/bin/cat'], stdin=subprocess.PIPE)
>>> p.stdin.write("Are you there?")
>>> Are you there?
>>> import os
>>> new_env = {"LOGNAME" : "brock", "UGH" : "Windows 10" }
>>> p = subprocess.Popen([puzzle_bin, "macOS"], env=new_env, stdin=subprocess.PIPE)
>>> p.stdin.write(str(p.pid)+'\n')
>>> p.wait()
0
>>>