Re: bash expansion crap...

[ss11223 <ss11223@gmail.com>]

On Oct 2, 3:40 pm, Andrew Sackville-West <and...@farwestbilliards.com>
wrote:
> Hey folks, help me out with this...please
>
> andrew@basement:~$ for i in {1..3}; do echo $i; done
> 1
> 2
> 3
> andrew@basement:~$ TEST=3; for i in {1..$TEST}; do echo $i; done
> {1..3}
>
> in the first example, its obvious. In the second, $TEST gets replaced
> with 3, but then the {} doesn't get expanded. I'm sure I have to do
> some kind of wacky $({[ type thing, but I'm not able to grok it. any
> ideas?
>
> the purpose is to be able to easily update some loops in a script for
> different numbers of object to iterate over. obvious, I guess.
>
> A
>
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This works for me, BASH can do arithmetic!

 TEST=3;  for (( i=1; i<=$TEST; i++)); do echo $i; done

Stuart