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my $nline = "\n";
my $comma = ",";
...
     print OUTPUT $column[4],$comma,$column[5],$comma,$column[7],$comm
+a,$column[8],$comma,$A,$comma,$B,$comma,$nline;

# $/ = "\n" # Input RS already defined
$, = ",";
...
     print OUTPUT $column[4],$column[5],$column[7],$column[8],$A,$B;
     print $/; # or use 'say' as it was said.

     print OUTPUT "$column[4],$column[5],$column[7],$column[8],$A,$B\n
+";