I think you are looking for something like IPC::Run3 which would allow you to run a program, capture the output to a variable, parse the variable and then run another command with parameters derived from the output of the preceding command.

Below is a contrived example that you can change to meet your own requirements.

use strict;
use warnings;

use IPC::Run3;    

my @command1 = ('batch1.bat', 'BF1_PARAM1', 'BF1_PARAM2');
my ($in1, $out1, $err1);

run3 \@command1, \$in1, \$out1, \$err1;

chomp($out1);
print "BATCH FILE 1: [$out1]\n";

my @command2 = ('batch2.bat');
my ($in2, $out2, $err2);

if ($out1 =~ /batch\s+file\s+output/i) {
   push(@command2, 'BF2-PARAM1');
   push(@command2, 'BF2-PARAM2');
}

run3 \@command2, \$in2, \$out2, \$err2;

chomp($out2);
print "BATCH FILE 2: [$out2]\n";

my @command3 = ('batch3.bat');
my ($in3, $out3, $err3);

if ($out2 =~ /batch\s+file\s+output/i) {
   push(@command3, 'BF3-PARAM1');
   push(@command3, 'BF3-PARAM2');
}

run3 \@command3, \$in3, \$out3, \$err3;

chomp($out3);
print "BATCH FILE 3: [$out3]\n";

print "Done\n";
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And the batch files I used (make 3 files using the below code and name batch1.bat, batch2.bat, and batch3.bat:

@ECHO OFF

SET PARAM1=%~1
SET PARAM2=%~2

ECHO BATCH FILE OUTPUT: %PARAM1% %PARAM2% 

EXIT 0
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This results in the following:

F:\ipctest>perl ipc_run3_test.pl
BATCH FILE 1: [BATCH FILE OUTPUT: BF1_PARAM1 BF1_PARAM2 ]
BATCH FILE 2: [BATCH FILE OUTPUT: BF2-PARAM1 BF2-PARAM2 ]
BATCH FILE 3: [BATCH FILE OUTPUT: BF3-PARAM1 BF3-PARAM2 ]
Done
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