Run multiple lines of cmd command using python

Question

I am trying to run to cmd code using python.

p = 'calcifer --config="C:\\Users\\yilin.chen\\Desktop\\pythonminingstuff\\calcifer\\calcifer\\pipelines\\run_config.yaml"'
subprocess.call('cd C:\\Program Files (x86)\\Olympus\\Vanta\\bin', shell = True)
subprocess.call(p, shell = True)

And later I found that, these two line of code should be ran together. So I tried

commands = """ SET foo=1 | SET foo=2 | echo %foo% """
b = subprocess.check_output(commands, shell=True)
print(b.decode('ascii'))

Which is posted here as a guide https://mail.python.org/pipermail/tutor/2013-January/093474.html But it doesn't work for me. The code above only executes the lasty line which prints a %foo%.If I copy and paste the orirginal code, it only prints 'hello'.

Any thoughts? I appreciate your help.

I presume you are assuming that the | character is a command separator? — Bill_Stewart
– Bill_Stewart, Commented May 9, 2018 at 21:36

Samuel Dion-Girardeau · Accepted Answer · 2018-05-09 21:37:40Z

2

It seems like the first command you are trying to execute is to cd into a directory, which can be achieved by setting the cwd parameter in subprocess.call.

To give you a little example, I copied the echo binary to /Users/Samuel/tmp/eecchhoo. If I try to go in the directory, then call the binary in two subprocess calls, I will have a failure, as you described:

>>> import subprocess
>>> subprocess.call('cd /Users/Samuel/tmp', shell=True)
0
>>> subprocess.call('./eecchhoo helloworld', shell=True)
/bin/sh: ./eecchhoo: No such file or directory
127

However I can make the call succeed by setting the cwd parameter to the value I want:

>>> import subprocess
>>> subprocess.call('./eecchhoo helloworld', shell=True, cwd='/Users/Samuel/tmp')
helloworld
0

If you need to run other commands (not only to change the working directory), you can refer to this answer: Python: execute cat subprocess in parallel.

answered May 9, 2018 at 21:37

Samuel Dion-Girardeau

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3 Comments

Drake .C Over a year ago

It's amazing. But if I am going to do two 'echo', what should I do?

Samuel Dion-Girardeau Over a year ago

@ChenLin You can use subprocess.call like you did, but you need to separate the different commands correctly. On my platform (Mac OS), I can use && ("and" operator) or ; ("or" operator): subprocess.call('echo hello && echo world', shell=True) and subprocess.call('echo hello ; echo world', shell=True) both work.

Drake .C Over a year ago

I tried and it worked, thank you so much for your help. I really appreciate it.

Elyasaf755 · Accepted Answer · 2020-06-16 14:59:57Z

1

Use the '&&' operator.
For your example:

p = 'calcifer --config="C:\\Users\\yilin.chen\\Desktop\\pythonminingstuff\\calcifer\\calcifer\\pipelines\\run_config.yaml"'
subprocess.call('cd C:\\Program Files (x86)\\Olympus\\Vanta\\bin && ' + p, shell = True)
subprocess.call(p, shell = True)

You can also use os.system(command) to do the exact same thing:

import os
p = 'calcifer --config="C:\\Users\\yilin.chen\\Desktop\\pythonminingstuff\\calcifer\\calcifer\\pipelines\\run_config.yaml"'
os.system('cd C:\\Program Files (x86)\\Olympus\\Vanta\\bin && ' + p)

You can read more about it here.

answered Jun 16, 2020 at 14:59

Elyasaf755

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