subtract days from a date in bash

Question

I want to subtract \"number of days\" from a date in bash. I am trying something like this ..

echo $dataset_date #output is 2013-08-07

echo $date_diff #outp         


        

Answer 1

Below code gives you date one day lesser

ONE=1
dataset_date=`date`
TODAY=`date -d "$dataset_date - $ONE days" +%d-%b-%G`
echo $TODAY