Hi, I am new to Perl so I am not sure whether this is stupid question, I will ask it anyway... I have about 100 Linux VMs on which My task is to find the uptime on all the servers. I am using expect module. My expect command works fine when I am logging to just one server. However, I have got a list of ip addresses saved in a file and want my expect script to loop through it . This is where it is failing. Here is my Perl code:

#!/usr/bin/perl

#use strict;
use warnings;
use Expect;

open FILE, "ip_address";
#while (<FILE>)
my @ip_array = <FILE>;
foreach (@ip_array)
{
   chomp ($_);
   my $command = "ssh";
   my @parameters = ('$_', 'uptime');
   
   my $exp = Expect->spawn($command, @parameters)
      or die "Cannot spawn $command: $!\n";

    $exp->expect(
                [ qr/yes/ => sub { my $exp = shift;
                               $exp->send("yes\n");
                               exp_continue; }],
                [qr/assword/i => sub { my $exp = shift;
                               $exp->send("1234\n");
                               exp_continue; }]
                )
}
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WHERE: ip_address: is the list of my ip addresses 1234: password for the user

and the output I get is:

ssh: Could not resolve hostname $_: Name or service not known
ssh: Could not resolve hostname $_: Name or service not known
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from what I understand, the expect module takes two arguments: $command and @parameters. I am missing something in the while loop while passing the individual ip address values to the Expect object. I know my below code works fine when I explicitly provide the ip address of the server I want to login. So I need help on figuring out while loop in above code. Here is the code which works fine:

#!/usr/bin/perl

#use strict;
use warnings;
use Expect;

my $command = "ssh";
my @parameters = ('10.10.10.10', 'uptime');
   
my $exp = Expect->spawn($command, @parameters)
   or die "Cannot spawn $command: $!\n";

 $exp->expect(
             [ qr/yes/ => sub { my $exp = shift;
                            $exp->send("yes\n");
                            exp_continue; }],
             [qr/assword/i => sub { my $exp = shift;
                            $exp->send("1234\n");
                            exp_continue; }]
             )
[download]

for the Expect syntax, I have been referring the "perldoc Expect" please excuse my English. Many thanks.