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use strict;
use warnings;
...
print "BATCH FILE 3: [$out3]\n";

print "Done\n";

@ECHO OFF
...
ECHO BATCH FILE OUTPUT: %PARAM1% %PARAM2% 

EXIT 0

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