In addition to all of the above, have a look at IPC::Run. It's a very simple and intuitive interface for doing all the easy things, while at the same time being a pretty good interface for doing the hard things, too. For example: 
use IPC::Run qw( run );
# just a silly command to execute in another process, to demonstrate
# how input, output and error all relate
my $command = q<perl -lpe 's/b/t/; warn qq{Oh, no!  A z in "$_"!  What
+ a world, what a world!\n} if /z/'>;

# but that way is sensitive to what shell you are using,
# (whether it is ok to use ' or " to quote in the shell)
# this way is shell-independant:
$command = ['perl', '-lpe', 's/b/t/; warn qq{Oh, no!  A z in "$_"!  Wh
+at a world, what a world!\n} if /z/'];

my ($in, $out, $err);
$in = "foo\nbar\nbaz\n";
run $command, \$in, \$out, \$err;

[download]
would give you "foo\ntar\ntaz\n"; in $out (the output of the program) and "Oh, no!  A z in "taz"!  What a world, what a world!\n" in $err (the STDERR of the program). 
------------
:Wq
Not an editor command: Wq

[download]

In reply to Re: 2 way pipe? by etcshadow
in thread 2 way pipe? by monoxide

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.