sample shell script to loop between the date ±1 specified by argument

[japanese(日本語)]

This is sample shell script to loop between the date ±1 specified by argument.

#!/bin/sh
START=$1
END=$2


START_1DAY_BEFORE=`date '+%Y%m%d' -d "1 days ago ${START}"`
END_1DAY_AFTER=`date '+%Y%m%d' -d "-1 days ago ${END}"`


echo $START_1DAY_BEFORE

for j in {0..10000}; do
    TARGET_YYYYMMDD=`date '+%Y%m%d' -d "-$j days ago ${START_1DAY_BEFORE}"`
    echo ${TARGET_YYYYMMDD}

    if [ ${TARGET_YYYYMMDD} -gt ${END_1DAY_AFTER} ]; then
       break
    fi
done