case 条件语句

[root@gfs-node122 shell]# cat 1.sh 

#！/bin/bash

read -p "please input a number:" jin
case "$jin" in 
    1) 
    echo "The num you input is 1"        
    ;;

        2)

    echo "The num you input is 2"

      ;;
      [3-9])
      echo "The num you input is $jin"
      ;;
       *)  
  echo "please input [0 9] int"
 exit ;
esac 
 

[root@gfs-node122 shell]# bash  1.sh
please input a number:jin
please input [0 9] int
[root@gfs-node122 shell]# bash  1.sh
please input a number:1
The num you input is 1
[root@gfs-node122 shell]# bash  1.sh
please input a number:3
The num you input is 3