It's an interesting use of Expect, but ssh can be configured to log in without the password prompt, which may be more appealing from a security standpoint because you get key-level authentication instead of a simple password.

Of course, OpenSSH and SSH act differently with regards to configuration. Look in the man page for references to "authorized_keys" for more info.

This is a little off-topic, but here is how SSH-SSH (for lack of a better term) operates.

With SSH2, on server A, you would have a file like:

      ~/.ssh2/identification
      ----------------------
      IdKey id_dsa_1024_a
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On server B, where you want to connect with no password:

      ~/.ssh2/authorization
      ----------------------
      Key id_dsa_1024_a.pub
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You would copy the "id_dsa_1024_a.pub" key from server A over to server B and put it in ~/.ssh2/

ObPerl:
Just for kicks, here's a Quick Hack that I put together to schlep keys around from one box to several others.

#!/usr/bin/perl
#
# ssh-addauth - Adds automatic login to a remote SSH server
#               from the current machine.

use strict;

use Sys::Hostname;

my ($default_key)  = "id_dsa_1024_a.pub";

# These parameters may come from: /etc/ssh2/ssh2_config
my ($ssh_dir)      = ".ssh2";           # UserConfigDirectory
my ($ssh_authfile) = "authorization";   # AuthorizationFile
my ($hostname)     = hostname();
my ($username)     = getpwuid($<);

foreach my $arg (@ARGV)
{
        AddAuth($arg);
}

sub AddAuth
{
        my ($remote_host) = @_;

        system ("scp $ENV{HOME}/$ssh_dir/$default_key $remote_host:$ss
+h_dir/${username}_${hostname}_dsa_1024.pub");
        system ("ssh $remote_host \"echo 'Key ${username}_${hostname}_
+dsa_1024.pub' >> $ssh_dir/$ssh_authfile\"");
}
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