Dear Brothers, I am looking for some experienced monks who are willing to help a humble novice. Since one month I am learning PERL with different Books and each day I like it more and more. I am trying now to solve some Problems with PERL. And here my Problem:

Somebody wrote an awfull Java-Program that I need to interact with. This Program asks me allways the same questions, but he doesn't allow to give it as attribute or to read (like <<<EOF). It runs in a machine which doesn't allow me to compile, so no CPAN help. He has the usual suspects modules like IPC::Open3, which I used to interact with the Program. And when I thought I had it, I saw that this Program calls another Java-Program and open for it a new child. With my Solution I cannot access to the Grandchild to give him the input. Here my Code:

use IPC::Open3;

local(*START_IN, *START_OUT, *START_ERR);

my $childpid = open3(*START_IN, *START_OUT, *START_ERR, 'external.sh')
+;

while (<START_OUT>) {
        print;
        if (/Question1/) {
            print START_IN "Answer1";
        }
        elsif (/Question2/) {
            print START_IN "Answer2";
        }
}

[download]

When I run this "Interact.pl", he prints out some input and stops when he calls the Java-Program. And that's all. My Solaris ptree looks like that:

8278  zsched
  9312  -ksh
     590   bash
       28268 /usr/perl5/5.8.4/bin/perl ./Interact.pl
          28269 /usr/bin/ksh /tools/external.sh
             28270 java ExternalPG

[download]

In reply to Interact external Program's child. by gyrson

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