import time
import shlex
from subprocess import *`

#list of commands
commands = ['sleep 5', 'ls -l', 'find /usr','sleep 3','uptime']

#executing each command in the list
for command in commands:
     cmd = shlex.split(command)
     # Need to time this and the moment it is finished executing.
     x = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)

import threading,time,subprocess,shlex

time_dict = {}

def time_me(command):
    start_time = time.time()
    cmd = shlex.split(command)
    subprocess.call(cmd)
    time_dict[command] = time.time() - start_time

threads = []
commands = ['sleep 5', 'ls -l', 'find /usr','sleep 3','uptime']

for command in commands:
    t = threading.Thread(target=time_me,args=(command,))
    t.start()
    threads.append(t)

for t in threads:
    t.join()

print(time_dict)

import time
import shlex
from subprocess import *

#list of commands
commands = ['sleep 5', 'ls -l', 'sleep 3', 'uptime'] # 'find /usr' made me really impatient
times = {}
running = {}
#executing each command in the list
for command in commands:
    start_time = time.time()
    cmd = shlex.split(command)
    times[command] = time.time()
    running[command] = Popen(cmd,
                             # no shell=True, shlex already did the split
                             stdout=PIPE, stderr=PIPE)

while len(running):
    finished = set()
    for cmd, proc in running.items():
        if proc.poll() is not None:
            times[cmd] = time.time() - times[cmd]
            finished.add(cmd)

    for cmd in finished:
        del running[cmd]

print(times)