It is often necessary to work out yesterdays or tommorrows dates in scripts. Here's an easy way to do it.

#!/bin/sh 
Yesterday=`TZ=PST+24 date +%D` 
echo "Yesterday is:" $Yesterday 

Tomorrow=`TZ=PST-24 date +%D` 
echo "Tomorrow is: " $Tomorrow 

Today=`date +%D` 
echo "Today is:" $Today

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