The following bash script is to generate integers from 1 to 11, having 3-digit format.

#!/bin/bash
for i in `seq -f "%03g" 1 11`
do
   echo $i
done 
exit 0 

The result is as follows.

 001
 002
 003
 004
 005
 006
 007
 008
 009
 010
 011