Reading output from pexpect sendline

Question

I have pexpect, but I have problems printing output from it. In my test script below, it creates an ssh connection and then sends sudo su -, then my password, and then sends a line that needs sudo access (I also added p.interact () several times to make sure it is at the root ) The problem I am facing is returning the output of the commands that I run. In the end, I want to run some upper commands, and some du -h and other (much more complex) space commands. But currently, when he tries to print p.before, I get:

Traceback (most recent call last): File "./ssh.py", line 37, in <module> print p.before() TypeError: 'str' object is not callable 

Here is the script I'm working with (edited to remove my pass, etc.)

 #!/usr/bin/env python import pexpect import struct, fcntl, os, sys, signal def sigwinch_passthrough (sig, data): # Check for buggy platforms (see pexpect.setwinsize()). if 'TIOCGWINSZ' in dir(termios): TIOCGWINSZ = termios.TIOCGWINSZ else: TIOCGWINSZ = 1074295912 # assume s = struct.pack ("HHHH", 0, 0, 0, 0) a = struct.unpack ('HHHH', fcntl.ioctl(sys.stdout.fileno(), TIOCGWINSZ , s)) global global_pexpect_instance global_pexpect_instance.setwinsize(a[0],a[1]) ssh_newkey = 'Are you sure you want to continue connecting' p=pexpect.spawn('ssh user@localhost ') i=p.expect([ssh_newkey,'password:',pexpect.EOF,pexpect.TIMEOUT],1) if i==0: print "I say yes" p.sendline('yes') i=p.expect([ssh_newkey,'password:',pexpect.EOF]) if i==1: print "I give password", p.sendline("mypassword") elif i==2: print "I either got key or connection timeout" pass elif i==3: #timeout pass global global_pexpect_instance global_pexpect_instance = p p.sendline("sudo su -") p.sendline("mypasswd") p.sendline("mkdir /home/user/test") print p.before 

I am working on this link: http://linux.byexamples.com/archives/346/python-how-to-access-ssh-with-pexpect/

Any help is greatly appreciated.

EDIT: As noted by Armin Rigo. I called p.before as a function, e.g. p.before (). A stupid mistake on my part, as this explains why I got this error today, and not yesterday when I tried to do this. After making this change to my script and changing the command to send, type p.before and no output will be returned. Any other ways to return the output from the sendline () command?

Answer 1

Use a log file, this log file stores all output in the terminal. use this code example: -

 child = pexpect.spawn("ssh user@localhost ") child.logfile = open("/tmp/mylog", "w") child.expect(".*assword:") child.send("guest\r") child.expect(".*\$ ") child.sendline("python -V\r") 

open the log file and view all terminal events

Answer 2

To get full output after using the send line, child.read ()

eg.

 cmd_resp = pexpect.spawnu(cmd) # for execution of the command str_to_search = 'Please Enter The Password' cmd_resp.sendline('yes') # for sending the input 'yes' resp = cmd_resp.expect([str_to_search, 'password:', EOF], timeout=30) # fetch the output status if resp == 1: cmd_resp.sendline(password) resp = cmd_resp.expect([str_to_search, 'outputString:', EOF], timeout=30) print(cmd_resp.read()) # to fetch the complete output log