#!/bin/bash

 today=$(date "+%Y%m%d")

 echo 'today is :'${today}

 single_input="raw_data/"

 startday=$(date "+%Y%m%d" -d  '90 days ago')

 endday=$(date "+%Y%m%d" -d  '1 days ago')

 curday=${startday}

 while (( $curday <= $endday ))

 do

   input=${single_input}${curday}/

     if [ $curday -eq $startday ];then

         all_input=$input

     else

         all_input=$all_input","$input

     fi

     curday=`date -d "+1 day $curday" +%Y%m%d`

 done

 echo $all_input