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start=20200101
end=20201231
date=$start
while [ $date -le $end ]
do
date=`date -d "$date+1 days" +%Y%m%d`
donehttps://www.cyberciti.biz/faq/how-to-add-days-to-date-and-get-new-date-on-linux/
How to add days to date and get new date on Linux - nixCraft
Explains how to add or subtract days using date command calculation on Linux, Unix, and macOS/*BSD operating system command line.
www.cyberciti.biz
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