++Perl Mouse!!!
this one works as expected: 
#!/usr/bin/perl -w

use strict;
use Getopt::Std;

my $what;
$| = 1;
my @hosts;
my %opts;

while (<STDIN>) {
  chomp;
  push(@hosts, $_);
}

getopts(':dw', \%opts);

$what .= ' bla' if $opts{'d'};
$what .= ' blabla' if $opts{'w'};

print "OK? [Y|n]>\n";
open my $kb, "<", "/dev/tty" or die;
while (<$kb>) {
  exit 1 if /^[nN]$/;
  last;
}

print "Did not stop, sorry!\n";

[download]
Running it now looks like this: 
$ echo -e "aaa\nbbb\nccc\n" | script.pl -d
OK? [Y|n]>
y
Did not stop, sorry!

$ echo -e "aaa\nbbb\nccc\n" | script.pl -d
OK? [Y|n]>
n

[download]
Thanks a lot for solving this!
Regards,
svenXY

ptum, I wasn't able to do it with seek - just out of curiosity - how would you do it?

In reply to Re: No interactivity (prompt) after reading from pipe by svenXY
in thread No interactivity (prompt) after reading from pipe by svenXY

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.