I exported such values to a module, but now I use the Tiny family to have them in a location which is *not* my script nor anywhere near perl development. I use Config::Tiny and Path::Tiny to create an .ini file:

$ ./2.initialize.pl 
$VAR1 = bless( {
                 'my_sftp' => {
                                'username' => 'netcool',
                                'domain' => '202.123.43.17',
                                'password' => 'Hello@123'
                              }
               }, 'Config::Tiny' );

created /home/bob/Documents/html_template_data/5.example.ini
$ cat /home/bob/Documents/html_template_data/5.example.ini
[my_sftp]
domain=202.123.43.17
password=Hello@123
username=netcool
$ cat 2.initialize.pl 
#!/usr/bin/perl -w

######
## USER: start here.
## The values you will need to populate to create a proper ini file ar
+e here. 
## Change the ones you need to. You shouldn't have to change any of th
+e 
## lexical perl. The most these example data will be is irrelevant.
######
use 5.011;
use Data::Dumper;
use Path::Tiny;
use Config::Tiny;

use constant {
  ENCODING => 'utf8'
};

my %config = (
  my_sftp => {
    domain   => '202.123.43.17',
    username => 'netcool',
    password => 'Hello@123',

  },

);
1;
my $ini_file = "5.example.ini";
my $ref_config = \%config;
my $ini_path = path( "/home/bob/Documents/html_template_data", $ini_fi
+le );
## USER      make path here^^^^^appropriate for your machine
my $ini = bless $ref_config, 'Config::Tiny';
say Dumper $ref_config;
# this will clobber any previous file of same name
$ini->write( $ini_path, ENCODING );
say 'created ', $ini_path;

__END__ 
$
[download]

Then when you want to create an sftp object, you call the values back:

$ ./3.sftp1.pl upload_file
ini path is /home/bob/Documents/html_template_data/5.example.ini
$VAR1 = bless( {
                 'my_sftp' => {
                                'password' => 'Hello@123',
                                'domain' => '202.123.43.17',
                                'username' => 'netcool'
                              }
               }, 'Config::Tiny' );

values are 202.123.43.17 netcool Hello@123
^C
$ cat 3.sftp1.pl 
#!/usr/bin/perl -w
use 5.011;
use Net::SFTP::Foreign;

my $upload_file = shift;
my $sftp = get_tiny();
my $server_dir = "perlmonks/scripts";
$sftp->mkdir("/$server_dir")  or warn "mkdir1 failed $!\n";
$sftp->setcwd("/$server_dir") or warn "setcwd1 failed $!\n";
$sftp->put($upload_file)        or warn "upload put failed $!\n";
my $remote_dir = $sftp->cwd;
say "remote dir is $remote_dir";
my $ls =  $sftp->ls( $remote_dir);
print "$_->{filename}\n" for (@$ls);
undef $sftp;

sub get_tiny {

  use 5.011;
  use warnings;
  use Net::SFTP::Foreign;
  use Config::Tiny;
  use Data::Dumper;

  my $ini_path = qw( /home/bob/Documents/html_template_data/5.example.
+ini );
  say "ini path is $ini_path";

  my $sub_hash = "my_sftp";
  my $Config   = Config::Tiny->new;
  $Config = Config::Tiny->read( $ini_path, 'utf8' );
  say Dumper $Config;
  # -> is optional between brackets
  my $domain   = $Config->{$sub_hash}{'domain'};
  my $username = $Config->{$sub_hash}{'username'};
  my $password = $Config->{$sub_hash}{'password'};

  #dial up the server

  say "values are $domain $username $password";
  my $sftp = Net::SFTP::Foreign->new(
    $domain,
    user     => $username,
    password => $password,

  ) or die "Can't connect: $!\n";
  return $sftp;
}

__END__ 

$
[download]

I'm not sure how different forms of sftp'ng are in terms of security. You could go the next step and encrypt the .ini file if you think you need such measures. Hope this helps....

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