I have created a Subprocess object. The subprocess invokes a shell, I need to send the shell command provided below to it. The code I've tried:
from subprocess import Popen, PIPE
p = Popen(["code.exe","25"],stdin=PIPE,stdout=PIPE,stderr=PIPE)
print p.communicate(input='ping 8.8.8.8')
The command doesn't execute, nothing is being input into the shell. Thanks in advance.
If I simulate code.exe to read the arg and then process stdin:
#!/usr/bin/env bash
echo "arg: $1"
echo "stdin:"
while read LINE
do
echo "$LINE"
done < /dev/stdin
and slightly update your code:
import os
from subprocess import Popen, PIPE
cwd = os.getcwd()
exe = os.path.join(cwd, 'foo.sh')
p = Popen([exe, '25'], stdin=PIPE, stdout=PIPE, stderr=PIPE)
out, err = p.communicate(input='aaa\nbbb\n')
for line in out.split('\n'):
print(line)
Then the spawned process outputs:
arg: 25
stdin:
aaa
bbb
If input is changed without a \n though:
out, err = p.communicate(input='aaa')
Then it doesn't appear:
arg: 25
stdin:
Process finished with exit code 0
So you might want to look closely at the protocol between both ends of the pipe. For example this might be enough:
input='ping 8.8.8.8\n'
Hope that helps.
