bash shell nested for loop

Question

I want to write a nested for loop that has to work in the bash shell prompt. nested for loop in Single line command.

For example,

for i in a b; do echo         


        

Answer 1

The question does not contain a nested loop, just a single loop. But THIS nested version works, too:

# for i in c d; do for j in a b; do echo $i $j; done; done
c a
c b
d a
d b