Not able to execute command in remote machine Using Net::SSH::Expect

Question

I wanted to make the remote connection and automate the change password of any user account in that remote machine so I am using Perl Net::SSH:: Expect module. My connection is happening but I'm not able to perform any command on the remote machine. I am new to Perl language so there might be some mistakes in my code. I have tried searching for this but wasn't able to find something related to it.

Initially, I tried using Net:: OpenSSH and Expect module in combination but wasn't able to achieve the use-case.

#!/usr/bin/perl

use strict;
use warnings;
use Net::OpenSSH;
use Expect;

use Net::SSH::Expect;

my $uName= "user";

my $ssh = Net::SSH::Expect->new (
    host => "IPAddress",
    password=> "userPassword",
    user => $uName,
    raw_pty => 1
);

# logon to the SSH server using those credentials.
my $login_output = $ssh->login();
if ($login_output !~ /Welcome/) {
    die "Login has failed. Login output was $login_output";
}
#Random line display 
print "Connected to $uName\n";

#This is where I was trying the change password use case

$ssh->send("passwd") or die "Cannot execute the passwd command: $!\n";
$ssh->waitfor("Changing password for user.\n
(current) UNIX password: ", 3) or die "prompt 'password' not found after 1 second";
$ssh->send("oldPassword\n");
$ssh->waitfor("\n
Enter new UNIX password: " , 2) or die "prompt 'New password:' not found";
$ssh->send("newPassword");
$ssh->waitfor("\n
Retype new UNIX password: ", 1) or die "prompt 'Confirm new password:' not found";
$ssh->send("newPassword");

#$ssh->send("") or die "Cannot spawn: $!\n";
$ssh->close();

This the output i am getting

Cannot execute the passwd command

New Update

I tried executing a simple command just to check whether any command is getting executed or not. It is but still, my change password use case using send(passwd) is not.

#!/usr/bin/perl

use strict;
use warnings;
#use Net::OpenSSH;
#use Expect;

use Net::SSH::Expect;

#
# You can do SSH authentication with user-password or without it.
#
my $uName= "admin1";
# Making an ssh connection with user-password authentication
# 1) construct the object
my $ssh = Net::SSH::Expect->new (
    host => "192.168.56.101",
    password=> "Passw0rd1",
    user => "admin1",
    raw_pty => 1
);

# 2) logon to the SSH server using those credentials.
# test the login output to make sure we had success
my $login_output = $ssh->login();
if ($login_output !~ /Welcome/) {
    die "Login has failed. Login output was $login_output";
}
print "Connected to $uName\n";

This is the new simple command i am trying to execute

my $who = $ssh->exec("who");
print ($who);

My old use case with die removed from send()

$ssh->send("passwd");
$ssh->waitfor("Changing password for $uName.\n(current) UNIX password: ", 2) or die "prompt 'password' not found after 2 second";
$ssh->send("Passw0rd1\n");
$ssh->waitfor("\nEnter new UNIX password: " , 2) or die "prompt 'New password:' not found";
$ssh->send("qwerty123");
$ssh->waitfor("\nRetype new UNIX password: ", 1) or die "prompt 'Confirm new password:' not found";
$ssh->send("qwerty123");


$ssh->close();

Now the output is coming like this

admin3@admin3-VirtualBox:~/Desktop$ perl NetSSHExpect.pl 
Connected to admin1
admin1   :0           2019-07-19 11:49 (:0)
admin1   pts/1        2019-07-19 12:41 (192.168.56.1)
admin1@admin1-VirtualBox:~$ prompt 'password' not found after 2 second at NetSSHExpect.pl line 36.
admin3@admin3-VirtualBox:~/Desktop$

Answer 1

According to the documentation :

void send($string) - sends $string to the SSH server, returns nothing
Sends the string to the SSH server.

So don't check the return value, just remove the or die .. part after the send() :

$ssh->send("passwd");   # <-- no error code is returned here..