Re: bash increment in a given way

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On 11 December 2010 14:34, S Mathias <smathias1972@xxxxxxxxx> wrote:
It's ok, that i can use this, when i want an incrementing sequence, in a given way:

# {START..END..INCREMENT}
$ for i in {0..10..2}; do echo "Welcome $i times"; done
Welcome 0 times
Welcome 2 times
Welcome 4 times
Welcome 6 times
Welcome 8 times
Welcome 10 times
$

but what's the "magic" for this? :

$ MAGIC; do echo "Welcome $i times"; done
Welcome 0 times
Welcome 1 times
Welcome 4 times
Welcome 5 times
Welcome 8 times
Welcome 9 times
$

All you need to do is work out the function behind the sequence. To generate this particular sequence, you need 2 loops, and outer one counting from 0..2 and an inner one counting between 0..1:

for n in {0..2};
do
   for m in {0..1};
   do
      echo "Welcome $(((n * 4) + m)) times";
   done;
done;

or, in one line:

for n in {0..2}; do for m in {0..1}; do echo "Welcome $(((n * 4) + m)) times"; done; done;

--
Sam
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