Hi , I am trying to do a "su -" in a remote machine and run some commands as root.

With the below script i am able to login to the remote machine, but i get "su: incorrect password" error even when the password is correct, i guess i am not passing the password in the correct format.

Please look at the below code and let me know where i am going wrong Thanks.

#! /usr/bin/perl
use Net::SSH::Expect;

#Preparing for ssh session
my $ssh = Net::SSH::Expect->new (
    host=>"poseidon",
    user=>'testusr',
    timeout=>10,
    raw_pty=>1,
    password=>'wel123go',
    log_file=>"log.txt"
);

#Logging in to the session
$ssh->login();
print "Logged in \n";

# Commands executed
$ssh->exec("stty raw -echo");
$whoami=$ssh->exec("whoami");

print "\$whoami : ",$whoami,"\n";  

$ssh->send("su -");
$ssh->waitfor('Password:\s*\z', 1) or die "prompt 'Password' not found
+ after 1 second";

my $pass = 'passw0rd';

$result =  $ssh->send($pass);

print "\$result : ",$result,"\n";

$whoami=$ssh->exec("whoami");   

print "\$whoami : ",$whoami,"\n";  # Expect to see root

#closing the session
$ssh->close();
[download]

Content of the log file :

Password:

Last login: Tue Sep 1 23:53:01 2009 from poseidon.com^M

testusr@poseidon.com:~> testusr@etshmctbox10:~> hscpe

testusr@poseidon.com:~> Password:

su: incorrect password

testusr@etshmctbox10:~>