linux shell memo

 NOW=$(date +"%Y%m%d")

 N=`expr $NOW - 1`


==============================
計算每個月的最後一天
=============================

YEAR=`date +%Y`
MONTH=`date +%m`
DAYS=`cal $MONTH $YEAR | grep -v "$YEAR" | grep -v "Tu"`
for day in $DAYS
do    
LAST=$day
done
echo $LAST