shell中实施年月日的判断

shell中实施年月日的判断

#!/bin/sh

#

if [ $MON = 01 ]
then
   YEAR=`expr $YEAR - 1`
   if [ $YEAR -lt 10 ]
   then
       YEAR="0$YEAR"
   fi
fi

if [ $MON -ge 2 ]
then
   MON=`expr $MON - 1`
   if [ $MON -lt 10 ]
   then
      MON="0$MON"
   fi
else
   MON=12
fi

case $MON in
        01|03|05|07|08|10|12)
        DATE=31;;
        04|06|09|11)
        DATE=30;;
        02)
        DATE=28;;
esac

TRIGGER=`expr $YEAR % 4`
if [ $TRIGGER = 0 -a $DATE = 28 ]
then
    DATE=29
fi