generate date list by shellscript

date.sh

#!/bin/sh

start_date="20120601"
end_date="20120610"

i=0
while [ 1 ] ;do
  now=`date +%Y%m%d -d "$start_date + $i days"`
  echo $now
  # command
  if [ $now = $end_date ] ;then
  break
  fi
  let i=$i+1
done