LinuxQuestions.org - python: pexpect problems?

I tried pexpect package to excute ssh, but get the exception, what is wrong?

Code:

>>> foo = pexpect.spawn('scp root@192.168.126.11:/root/expect-5.42.1-1.i386.rpm /tmp')

>>> foo.logfile = sys.stdout

>>> foo.expect('.*password:')

root@192.168.126.11's password: 0

>>> foo.sendline('symqfct')

symqfct

8

>>> foo.interact()





expect-5.42.1-1.i386.rpm 100% 148KB 147.7KB/s 00:00



Traceback (most recent call last):

File "<stdin>", line 1, in ?

File "/usr/lib/python2.3/site-packages/pexpect.py", line 1062, in interact

self.__interact_copy(escape_character)

File "/usr/lib/python2.3/site-packages/pexpect.py", line 1086, in __interact_copy

data = self.__interact_read(self.child_fd)

File "/usr/lib/python2.3/site-packages/pexpect.py", line 1075, in __interact_read

return os.read(fd, 1000)

OSError: [Errno 5] Input/output error

And I want to do something more complicated, like this:

Code:

>>> cmd = 'ssh %s@%s "cd %s; find . | grep %s.*%s.*%s >tmplist; tar -T tmplist -P -c -z -f -" | tar -C %s -x -z -f -' % (user, host, src, zone, FILE, strTime, dst)

>>> print cmd

ssh monitor@192.168.1.14 "cd /home/monitor; find . | grep QBO5.*objscenesserver.*060302 >tmplist; tar -T tmplist -P -c -z -f -" | tar -C /tmp/obj -x -z -f -

>>> import pexpect

>>> ssh = pexpect.spawn(cmd)

>>> ssh.expect('.*password:')

0

>>> ssh.sendline(passwd)

16

>>> ssh.interact()

The exception continues and I can't find the files in /tmp/obj, but if I run it in the shell, it does:

Code:

sh# ssh monitor@192.168.1.14 "cd /home/monitor; find . | grep QBO5.*objscenesserver.*060302 >tmplist; tar -T tmplist -P -c -z -f -" | tar -C /tmp/obj -x -z -f -

This print the gziped content the the standard input:

Code:

# ssh monitor@192.168.1.14 "cd /home/monitor; find . | grep QBO5.*objscenesserver.*060302 >tmplist; tar -T tmplist -P -c -z -f -"

and pexpect also done this, so "| tar -C /tmp/obj -x -z -f -" takes no effect when using pexpect package. Why?

Thanks.