Give response yes/no in python when a command is executed os.system() in python linux

Question

Consider a command like

yum install boto

When I execute in terminal, to proceed is asks me for yes/no

Can I respond to it in python like

os.system("yum install boto")

Next "Yes" is to be passed to terminal through the same python code so that it installs. Well, I dont think this works. If it is written after tha above statement

os.system("yes")

Please tell me if this is possible?

possible duplicate of Running an interactive command from within python — Martin Tournoij
– Martin Tournoij, Commented Feb 22, 2015 at 19:17
There's also: stackoverflow.com/questions/1567371/… (and probably a few more...) I searched for: python subprocess interactive — Martin Tournoij
– Martin Tournoij, Commented Feb 22, 2015 at 19:17
There are ways to do this, but the usual solution is to use a command-line option that prevents the program from asking questions. — user2357112
– user2357112, Commented Feb 22, 2015 at 19:17
I dont run yum actually, I run sudo scp -i for transferring files between two ec2 instances — Sailesh Kotha
– Sailesh Kotha, Commented Feb 22, 2015 at 19:23

Padraic Cunningham · Accepted Answer · 2015-02-22 19:38:35Z

7

You can use subprocess.Popen and write to stdin, you need the -S flag for sudo then just the rest of the commands.

from subprocess import Popen, PIPE
import getpass

pwd = getpass.getpass()
proc = Popen(['sudo', '-S', rest of commands ],stdout=PIPE, stdin=PIPE, stderr=PIPE,universal_newlines=True)
proc.stdin.write("{}\n".format(pwd))
out,err = proc.communicate(input="{}\n".format("yes"))

answered Feb 22, 2015 at 19:38

Padraic Cunningham

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1 Comment

Charles Duffy Over a year ago

Since proc.communicate(input='...') writes that input to proc.stdin, what's the point of the separate proc.stdin.write call? You could put both pwd and the string yes into one place.

Ben Wex · Accepted Answer · 2024-04-13 20:16:28Z

1

You can add a pipe and do

os.system("yes | yum install boto")

it will repeat yes until the command is done

edited Apr 13, 2024 at 20:16

Ben Wex

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answered Nov 21, 2017 at 20:05

elcapitan

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