Shell编程进阶 1.7 case选择

vim case.sh

#!/bin/bash
read -p "please input a number:" n
m=$[$n%2]
case $m in
        1)
                echo " It is a jishu‘"
                ;;
        0)
                echo " It is a oushu."
                ;;
        *)
                echo " Not is a jishu and oushu."
esac

#!/bin/bash
read -p "please input a number:" n
w=`echo $n |sed ‘s/[0-9]//g‘`
if [ -n "$w" ]
then
        echo "Not is a number,please input a number."
else
        echo $n
fi
m=$[$n%2]
case $m in
        1)
                echo " It is a jishu‘"
                ;;
        0)
                echo " It is a oushu."
                ;;
        *)
                echo " Not is a jishu and oushu."
esac