shell 时间 循环

#!/bin/bash
start=`date +%s -d "2015-05-27 00:00:00"`
end=`date +%s -d "2015-06-24 00:00:00"`

while [ "$start" -le "$end" ]
        do
                d=`date -d @$start "+%Y%m%d"`
                echo $d
                start=$((start+86400))
        done