Thank you! THAT is the clue I needed. I need to quote the stem names. Passing 
plain Index. passes "", the value of Index., to sort.

Problem solved. Thanks all.

CM

On Thu, 7 Mar 2024 16:22:02 +0000, Alan Young <ayo...@teleport.com> wrote:

>I think I have always used the position specification format. In a couple of 
>processes I ran before, I have
>
>xrc = BPXWUNIX("/bin/sort -bdu -k1.1,1.11 ","pl.","pls.")

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