[clug] Rosetta code: bash/bourne shell 'loops' example

[Kevin Pulo]

On Sun, Mar 21, 2010 at 09:04:53PM +1100, Hal wrote:

> On 03/21/2010 08:55 PM, steve jenkin wrote:
>> Peter Barker wrote on 21/03/10 8:01 PM:
>>    
>>> On Sun, 21 Mar 2010, steve jenkin wrote:
>>>
>>> I think I prefer this - what I think to be pretty idiomatic:
>>>
>>> pbarker at eccles:~$ for i in `seq 1 5`; do for j in `seq 1 $i`; do echo -n
>>> '*'; done; echo; done
>>>      
> So do I compared to the following bash-ism.
>
> $ for ((i=1; $i <=5; i=$i+1));do for ((j=1; $j <=$i; j=$j+1)); do printf  
> "*"; done; printf "\n"; done
>
> But it might save a fork or two.

Or O(n), considering there's a fork in the loop.

Have I missed something?  What's wrong with the ultra-simple:

n=5; s=""; while [ ${#s} -lt $n ]; do s="$s*"; echo "$s"; done

???

Kev.

-- 
.----------------------------------------------------------------------.
| Kevin Pulo                Quidquid latine dictum sit, altum viditur. |
| kev at pulo.com.au               _ll l_ng__g_e_ _r_ hi__ly p__d_ct__le. |
| http://www.kev.pulo.com.au/         God casts the die, not the dice. |
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