Adding a zero to single digit variable

Question

Trying to add a zero before the varaible if it\'s less than 10 and create said directory. I can\'t seem to get the zero to add correctly. Keeps resulting in making 02.1.20

Answer 1

Better:

for i in $(seq -f %02g 1 31)
do
    mkdir "$path/02.$i.2011"
done

Or even:

for i in {01..31}
do
    mkdir "$path/02.$(printf "%02d" $i).2011"
done