#! perl
use strict;
use warnings;
use Term::ReadKey;

sub read_input();

my $pw = read_password("Enter password: ", '*');
print "Password is: >$pw<\n";
read_input();

sub read_password
{
    local $| = 1;
    my   ($prompt, $mask) = @_;
    my    $password;
    print $prompt;

    ReadMode $Term::ReadKey::modes{noecho};
 
    while (1)
    {
        my $datum = ReadKey(-1);        # Non-blocked read
        next unless defined $datum;
        last if $datum =~ /\R/;

        if ("\ch" eq $datum)
        {
            print "\ch \ch" if chop $password;
            next;
        }

        $password .= $datum;
        print $mask;
    }

    ReadMode $Term::ReadKey::modes{restore};
    print "\n";
    return $password;
}

sub read_input()
{
    print "Input: ";
    my     $in = <STDIN>;
    chomp  $in;
    print "You entered: >$in<\n";
    return $in;
}
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Typical output:

13:46 >perl 881_SoPW.pl
Enter password: *****
Password is: >abcde<
Input: Hello, world!
You entered: >Hello, world!<

13:46 >
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