I need to send commands to shell "MYSHELL>" after it has been initiated.
prcs = subprocess.Popen("MYSHELL; cmnd1; cmnd2;",shell=True,
subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
outputPrcs, err = prcs.communicate()
print outputPrcs
Problem only entering shell is implemented, Other commands (cmnd1; cmnd2;)aren't sent.
Result: MYSHELL>
From the docs:
communicate(self, input=None)
Interact with process: Send data to stdin. Read data from
stdout and stderr, until end-of-file is reached. Wait for
process to terminate. The optional input argument should be a
string to be sent to the child process, or None, if no data
should be sent to the child.
Notice, Wait for process to terminate. I think what you need is pexpect. It isn't in the standard library, but it'll do what you want.
Example:
import pexpect
process = pexpect.spawn("python")
process.expect_exact(">>> ")
process.sendline('print("It works")')
process.expect("\n.*\n")
response = process.after.strip()
print(response)
Output:
It works
If you want to send input to your shell then you should pass it as an argument in communicate, like so:
prcs = subprocess.Popen("MYSHELL",shell=True,
subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
outputPrcs, err = prcs.communicate("cmnd1; cmnd2;")
print outputPrcs
test:
>>> from subprocess import *
>>> p = Popen("python", shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)
>>> o,e = p.communicate("print 'it works'")
>>> print o
it works
>>>
It will work @Ahmed. Try below code on linux:
from subprocess import *
cmd = "MYSHELL\ncmd1\ncmd2\n"
p = Popen('/bin/bash', shell=False, universal_newlines=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)
o, e = p.communicate(cmd)
print('Output: ' + o.decode('ascii'))
print('Error: ' + e.decode('ascii'))
print('code: ' + str(p.returncode))
MYSHELLis still executing. What your command means is "Start MYSHELL, wait for it to finish, and then do cmnd1 and cmnd2"