#!\bin\sh echo "options are :\n+:add\n-:substract\n*:multiply\n/:divide " echo "enter the 2 nos " read a read b echo "\nenter your choice " read ch case $ch in '+') y=`expr $a + $b` echo "sum = $y";; '-') y=`expr $a - $b` echo "diff = $y";; '*') y=`expr $a \* $b` echo "product = $y";; '/')y=`expr $a / $b` echo "division = $y";; *)echo "invalid choice ";; esac
