how to use subprocess.Popen execute "find" in windows

[clyfish]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*

C:\>

And os.system is OK. TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*
0
But I don't know how to use subprocess.Popen to do this.

from subprocess import Popen, PIPE

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

It doesn't work.
Because subprocess.Popen execute "find" like this.

C:\>find \"445\"
¾Ü¾ø·ÃÎÊ - \

C:\>

It adds a '\' before each '"'.
How to remove the '\'?
Thank you.

 

[Diez B. Roggisch]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*

C:\>

And os.system is OK.
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*
0

But I don't know how to use subprocess.Popen to do this.

While there certainly are valid usecases for piping with subprocess in
Python - this ain't one I'd say. Just read the output of netstat yourself,
and filter for lines that contain the desired pattern.

Diez

 

[BlueBird]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*

C:\>

And os.system is OK.>>> import os
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*
0



But I don't know how to use subprocess.Popen to do this.

from subprocess import Popen, PIPE

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

I would say that, according to documentation, the following should
work:
print p2.communicate()[0]


Philippe

 

[Justin Ezequiel]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*

C:\>

And os.system is OK.>>> import os
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*
0



But I don't know how to use subprocess.Popen to do this.

from subprocess import Popen, PIPE

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

It doesn't work.
Because subprocess.Popen execute "find" like this.

C:\>find \"445\"
¾Ü¾ø·ÃÎÊ - \

C:\>

It adds a '\' before each '"'.
How to remove the '\'?
Thank you.

cannot help with the backslashes but try findstr instead of find

 

[alito]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING
  UDP    0.0.0.0:445            *:*

C:\>

And os.system is OK.>>> import os
  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING
  UDP    0.0.0.0:445            *:*
0



But I don't know how to use subprocess.Popen to do this.

from subprocess import Popen, PIPE

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find',  '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

Get rid of the extra quotes. ie:
p2 = Popen(['find', '445'], stdin = p1.stdout, stdout = PIPE)

The quotes on the command line and on the os.system call are consumed
by the shell. The program doesn't see them.

 

[clyfish]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*

And os.system is OK.>>> import os

TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*
0

But I don't know how to use subprocess.Popen to do this.

from subprocess import Popen, PIPE

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

It doesn't work.
Because subprocess.Popen execute "find" like this.

C:\>find \"445\"
¾Ü¾ø·ÃÎÊ - \

It adds a '\' before each '"'.
How to remove the '\'?
Thank you.

cannot help with the backslashes but try findstr instead of find

Thank you.
findstr doesn't need quotes, so it works.

 

[clyfish]

In cmd, I can use find like this.

C:\>netstat -an | find "445"
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*

And os.system is OK.>>> import os

TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
UDP 0.0.0.0:445 *:*
0

But I don't know how to use subprocess.Popen to do this.

from subprocess import Popen, PIPE

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

Get rid of the extra quotes. ie:
p2 = Popen(['find', '445'], stdin = p1.stdout, stdout = PIPE)

The quotes on the command line and on the os.system call are consumed
by the shell. The program doesn't see them.

You must be a linux user

I guess, in windows, the quotes are consumed by the c runtime library.
Mayby the "find" in windows doesn't use the argc/argv but the windows
API GetCommandLine().

I wrote a c program to prove it.

#include <windows.h>
#include <stdio.h>

int main(int argc, char **argv) {
int i;

printf("%s\n", GetCommandLine());
for (i = 0; i < argc; ++i)
printf("%d: %s\n", i, argv);

return 0;
}

The output is:
C:\>test 1 2 "3"
test 1 2 "3"
0: test
1: 1
2: 2
3: 3

C:\>

Notice that, GetCommandLine() does not consume the quotes, but the
(char **argv) does.

 

[Gabriel Genellina]

p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()

It doesn't work.
Because subprocess.Popen execute "find" like this.

C:\>find \"445\"

It adds a '\' before each '"'.
How to remove the '\'?
Thank you.

cannot help with the backslashes but try findstr instead of find

Thank you.
findstr doesn't need quotes, so it works.

Build the command line yourself -instead of using a list of arguments-. Popen doesn't play with the quotes in that case:

p1 = Popen(['netstat', '-an'], stdout = PIPE) # using list
p2 = Popen('find "445"', stdin = p1.stdout, stdout = PIPE) # using str
print p2.communicate()[0]

 

[clyfish]

En Wed, 07 May 2008 23:29:58 -0300, <[email protected]> escribi¨®:

On May 6, 5:19 pm, (e-mail address removed) wrote:
p1 = Popen(['netstat', '-an'], stdout = PIPE)
p2 = Popen(['find', '"445"'], stdin = p1.stdout, stdout = PIPE)
print p2.stdout.read()
It doesn't work.
Because subprocess.Popen execute "find" like this.
C:\>find \"445\"
It adds a '\' before each '"'.
How to remove the '\'?
Thank you.
cannot help with the backslashes but try findstr instead of find

Thank you.
findstr doesn't need quotes, so it works.

Build the command line yourself -instead of using a list of arguments-. Popen doesn't play with the quotes in that case:

p1 = Popen(['netstat', '-an'], stdout = PIPE) # using list
p2 = Popen('find "445"', stdin = p1.stdout, stdout = PIPE) # using str
print p2.communicate()[0]

Thanks very much.
You solved my problem.