Specifically, I am trying to push the password to ssh-copy-id program, as it doesn't have a parameter, that I can use to feed the password noninteractively.
I've tried: 
#These two just exit after this command
$result = `ssh-copy-id -i $path_publick_key $user\@$server 2>/dev/null
+ < "$password"`;
$result = `ssh-copy-id -i $path_publick_key $user\@$server 2>/dev/null
+ < "$password\n"`;

#This gives a password prompt, without me printing the $result, which 
+makes me think, that ssh is using some named output device, instead o
+f stdout.
#$result is empty:
$result = `echo "$password"|ssh-copy-id -i $path_publick_key $user\@$s
+erver 2>/dev/null`;

[download]
use IPC::Cmd qw{run};

$ssh_cp_id = '';
$ssh_cp_id_result = run(
    'command'=>"ssh-copy-id -i $path_pk $user\@$server 2>/dev/null",
    'buffer'=>\$ssh_cp_id
);
if($ssh_cp_id_result){
    #print has no effect, as the password prompt got already displayed
+ without being captured to the $ssh_cp_id:
    print $ssh_cp_id;
}

[download]
I can't figure out how to do it. I need to use only standard modules or no modules at all, as our organization policy requires. I was already thinking about 'expect' cli program, it's not installed by standard on the system and the 'Expect' perl module, also nonstandard, so can't use them.

In reply to I am having a big difficulty with two way pipes from a system executed command by igoryonya

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