#!/bin/bash
#
echo "Enter your YEAR and MONTH."
read year month
#
if [ $month = [12] ]
  then year2=`expr $year - 1`
       month2=`expr $month + 12`
  else year2=$year
       month2=$month
fi
#
J=`expr $year2 / 100`
K=`expr $year2 % 100`
q=1
#
t1=` expr \( $month2 + 1\ ) \* 26 / 10`
t2=` expr $K / 4`
t3=` expr $J / 4`
h=` expr \( 1 + $t1 + $K + $t2 + $t3 - 2 \* $J ) % 7`