your program whould work, if you replace 1.3 with 1..3 and 1.10 with 1..10. .. is the range operator. And you may remove the first 3 lines from your example. Ahh and a typo on $ |= 1; it should read $| = 1; here the whole thing again.

#!/usr/bin/perl
use strict;
$SIG{PIPE} = 'IGNORE';
open( PIPE, "|net2.pl" ) or die "Cannot open pipe:$!";
select PIPE;
$| = 1;
select STDOUT;

my $count = 0;
for ( 1 .. 10 ) {
  warn "Writing line $_\n";
  if ( print PIPE "This is line number $_\n" ) {
    $count++;
  }
  else {
    warn " An error occured during writing :$!";
    last;
  }
  sleep 1;
}
close PIPE or die " Cannot close pipe : $!";
print "Wrote $count lines of text \n";
[download]

And net2.pl

#!/usr/bin/perl
use strict;
for (1..3) {
  last unless defined (my $line = <>);
  warn " Read_three,got $line\n";
}
[download]

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.