Fred L. Drake, Jr. wrote:
> Whatever happened to the old tried-but-true:
>     i=`expr $i + 1`

nothing, its just overkill

> I suspect using expr is more portable to the whole family of
> sh-derived shells than any of the more new-fangled ways.

Arithmetic expansion has been around for a long time, I wouldn't worry
about it.

Jamie Heilman         
"I was in love once -- a Sinclair ZX-81.  People said, "No, Holly, she's 
 not for you." She was cheap, she was stupid and she wouldn't load 
 -- well, not for me, anyway."                          -Holly

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