On 2009-03-14 20:10:29 -0400, Karthik Gurusamy said:
On Mar 14, 3:03 am, Roman Medina-Heigl Hernandez
wrote:
Karthik Gurusamy escribió:
On Mar 13, 6:39 pm, Roman Medina-Heigl Hernandez
wrote:
Hi,
I'm experimenting with Python and I need a little help with this. What
I'd
like is to launch an interactive shell, having the chance to send firs
t
several commands from python. I've written the following code:
#!/usr/bin/env python
import sys, subprocess
exe = "/bin/sh"
params = "-i"
-i says shell to be interactive. So looks like it is directly trying
to read from the terminal.
Well, then the question will be: is there any way to tell python to
directly "map" the terminal to the subprocess?
pexpect seems to be the solution for such problems :). [other
applications include ssh which asks for password from terminal (not
ssh's stdin)]
http://pexpect.sourceforge.net/pexpect.html
proc = subprocess.Popen([exe, params], stdin=subprocess.PIPE)
proc = subprocess.Popen([exe,], stdin=subprocess.PIPE)
works for me; but if there is an error 'sh' terminates.
If you want to simulate interactive, explore the pexpect module.
I'll get it a try :)))
proc.stdin.write("id\n")
while True:
line = sys.stdin.readline()
if not line:
note that a simple enter terminates the shell which you may not want.
Test my code and you'll see that this is not true :) When you hit enter
line will contain '\n' so it's not empty.
You are right. I thought readline() strips the trailing \n (It doesn't
and shouldn't as it's necessary for the case a file ends without a
newline).
break
proc.stdin.write(line)
Btw, another curiosity I have: is it possible to make a print not
automatically add \n (which is the normal case) neither " " (which happen
s
when you add a "," to the print sentence)? I found an alternative not
using print at all, eg: sys.stdout.write("K"). But it resulted strang
e
to me having to do that trick :)
I am also aware of only the sys.stdout.write solution.
python3.0 has a way to do it.
help(print)
Help on built-in function print in module builtins:
print(...)
print(value, ..., sep=' ', end='\n', file=sys.stdout)
Prints the values to a stream, or to sys.stdout by default.
Optional keyword arguments:
file: a file-like object (stream); defaults to the current
sys.stdout.
sep: string inserted between values, default a space.
end: string appended after the last value, default a newline.
print('hello', end='')
hello>>>
Karthik
Thank you for all your comments and comprenhension.
-r
sys.exit()
The problem is that when I launch it, python proggy is automatically
suspended. The output I got is:
ro...@rslabs:~/pruebas$ ./shell.py
ro...@rslabs:~/pruebas$ uid=1000(roman) gid=1000(roman) groups=1
000(roman)
ro...@rslabs:~/pruebas$
[2]+ Stopped ./shell.py
ro...@rslabs:~/pruebas$
Why and how to fix it? Would you suggest a better and more elegant way
to
do what I want?
As I see it, 'sh' is attempting to read from the keyboard and not from
stdin.
Karthik
Thank you.
--
Saludos,
-Roman
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Saludos,
-Roman
PGP Fingerprint:
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There is quite a bit involved in handling this. Check out this recipe
on activestate:
http://code.activestate.com/recipes/278731/
- Joe
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