Unix HowTo: Date substraction addition in UNIX

This is done using perl code snippet.

$ cat dateSubs.sh
TODAYS_DATE=`date|cut -d" " -f2,3,6|sed 's/ /-/g'`
a=`perl -e 'printf "%s", scalar localtime(time-604800)'`
WEEKS_BEFORE=`echo $a|cut -d" " -f2,3,5|sed 's/ /-/g'`

echo "TODAYS_DATE : $TODAYS_DATE"
echo "WEEKS_BEFORE: $WEEKS_BEFORE"

Result:-
$ dateSubs.sh
TODAYS_DATE : Oct-17-2007
WEEKS_BEFORE: Oct-10-2007
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