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# RETURNS: ( $stdout, $stderr )  Both are refs to an array of lines.
sub OSexecute {
...

    return ( \@stdout, \@stderr );
}

{
   my $file_name;
...
      print("\n", "\n");
   }
}

c:\tinyfile.txt
===============
...
c:\biggfile.txt
===============
*** HANGS ***

# RETURNS: ( $stdout, $stderr )  Both are refs to an array of lines.
sub OSexecute {
...

    return ( \@stdout, \@stderr );
}