If I write this script in python and execute it in a UNIX shell, would this execute the command one at a time, or send all the commands?

Question

Let's say the script is:
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#!/usr/bin/python3
import os
os.system('echo Hello')
os.system('echo Good day')

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Would this execute the first command, and then execute the second command immediately afterwards?

How would i write a script to make it so that the os executes the first command, wait until it's done, then execute the second command?

I need to do this with commands that will take a long time to run, and I need to make it so that the next command waits until the previous one is done executing before starting.

Anonymous · Accepted Answer

Why Python and not a shell script?

Yes the commands will be executed in sequence.  If you need to set up a control you have the command

wait

to which you can add the the process ID pid....

http://ss64.com/bash/wait.html

husoski · Answer

Yes, os.system() waits until the command completes before returning a result.  See the documentation at:
https://docs.python.org/2/library/os.html#os.system

(That's for Python 2.7.  Scroll to the very top of that page and use the version drop-down if you're using another version.)

brilliant_moves · Answer

Add this to your imports:

import time

Then insert at appropriate place:

time.sleep(1)

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If I write this script in python and execute it in a UNIX shell, would this execute the command one at a time, or send all the commands?

3 Answers