[O] org babel execute shell in sh?

[Panruo Wu]

Dear list,

#+begin_src sh
for np in {1..32}
do
    echo $np
done
#+end_src

when executing, the output only shows
{1..32}
which is clearly not I want..

After some investigation, I found that orgmode
uses "sh" that cannot understand the for loop above.

My question is, how can I suggest orgmode to use
"bash" to execute shell script?

I tried :shebang #!/bin/bash but it does not work

Thanks,
robb