qwurx [shmem] ~> perl -e 'open my $fh,"|-","ssh localhost"; while(<STDIN>){print $fh $_}'
Pseudo-terminal will not be allocated because stdin is not a terminal.

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
You have new mail.
touch blorflydick   <--- input at terminal
touch gobbledygook  <--- input at terminal
^D                  <--- input at terminal (Ctrl-D or eof)
qwurx [shmem] ~> ls -lrt | tail -2 <--- after perl terminated
-rw-r--r--  1 shmem shmem         0 Mar 15 18:30 blorflydick
-rw-r--r--  1 shmem shmem         0 Mar 15 18:30 gobbledygook

##</code><code>##

my @fh;
for my $ip (@ips) {
    open my $fh,"|-","ssh $ip" or die "Can't ssh to $ip: $!\n";
    push @fh, $fh;
}
while (<STDIN>) {
    for my $fh (@fh) {
        print $fh $_;
    }
}

##</code><code>##

    open my $fh,"|-","ssh $ip >/dev/null 2>&1" or die "Can't ssh to $ip: $!\n";