Hi Monks,

Currently I am facing a problem in the below perl code snippet. The code below is not a original script rather i just simulated the problem using this 

use IPC::Open2;
use IPC::Open3;
use strict;
use IO::Select;

my %ssh_handles;
my @nodes =  ('x','y','z');

my $val = "/test/*/26/*testingTESTING*"."\n";

my $command ='perl -e \"while(<>){chomp; \$val = \$_ ; \$res = \`ls -l
+ /mnt/\*/\$val \`;}\"';


foreach my $node ( @nodes )
{
   my ( $wtr , $rdr , $err ) = "";
   #my $pid = open3 ( $wtr , $rdr , $err , "ssh $node \$command" );
   #my $pid = open2 ( $wtr , $rdr , "ssh $node \"$command\"" );
   my $pid = open2 ( $wtr , $rdr , "ssh $node 'perl -e \"while(<>){cho
+mp;\$val=\$_;\$res=\`ls -l /mnt/\*/\$val\`;}\"'" );
   $ssh_handles{$node}{in} = $wtr if ( $wtr );
   $ssh_handles{$node}{out} = $rdr if ( $rdr );
   $ssh_handles{$node}{err} = $err if ( $err );
}

foreach my $node ( sort keys ( %ssh_handles ) )
{
   print {$ssh_handles{$node}{in}} $val;
   close $ssh_handles{$node}{in};
   my @ready;
   my $data = "";
   my $select = IO::Select->new($ssh_handles{$node}{out});
   if(@ready = $select->can_read(4.0))
   {
      foreach my $rh (@ready)
      {
         my ($len,$buffer);
         if($len = sysread($rh, $buffer, 4000))
         {
            if(!defined $len)
            {
               return undef;
            }
            $data .= $buffer;
         }
      }
   }
   print "[",$data,"]\n";

}

[download]
1) In the above code i would like to get the STDOUT messages but am not getting it.
I spent the whole day in this issue (tried by using open2 , simple open with | etc.), but i could not able to solve. So can you people please help me to resolve this issue.

Thanks & Regards,
R.Sivakumar

In reply to How and When to read STDOUT after using open3() funciton? by siva_kumar25

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