Hi ,
This is from one post in other shell group ..
I forgot who is the poster.
#! /bin/sh
year=`date +%Y`
month=`date +%m`
day=`date +%d`
# figure out what yesterday was.
day=`expr "$day" - 1`
case "$day" in
0)
month=`expr "$month" - 1`
case "$month" in
0)
month=12
year=`expr "$year" - 1`
;;
esac
# figure out the last day of the month
# day=`cal $month $year | grep . | fmt -1 | tail -1`
:$(cal $month $year)
day = $_
;;
esac
echo "$year$month$day"
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