generate a sequence of padded numbers with "seq"

$ seq -f "%02g" 1 10
01
02
03
04
05
06
07
08
09
10

Then, say you want to create a directory with each of those numbers:

for i in $(seq -f "%02g" 1 25); do mkdir "$i"; done

-f means "use a printf style format to print each number"

I had to go read the printf manual to find out what g means, but I still mostly don't understand:

gG          The argument is printed in style f (F) or in style e (E) whichever gives full precision in minimum space.

%02d doesn't work, I guess because the seq manual states All numbers are interpreted as floating point.