p8-expr.sh

几个简单实用的shell程序。它能使你更充分的了解linux下shell编程。

echo "Please enter a number:"
read n
echo -e "\n"


echo n+1
x1=`expr $n + 1`
echo 'x=`expr $n + 1`='$x1
#注意换行\n必须加上选项-e
echo -e "\n"


echo n-1
x2=`expr $n - 1`
echo 'x=`expr $n -1`='$x2
echo -e "\n"

echo n*1
y=`expr $n \* 1`
echo 'y=`expr $n \* 1`='$y
echo -e "\n"

echo n/2
z=`expr $n / 2`
echo 'z=`expr $n / 2`='$z
echo -e "\n"