Numbered for-loop in shell with leading zeros

bash

for (( num=1; num<=5; num++ )); do printf "%02d\n" $num; done

seq -f '%02g' 1 5

for num in $( seq -w 01 05 ); do echo $num; done

// from bash 4.0 onward

echo {01..05} 	      

for num in {01..05}; do echo $num; done