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```
#!/bin/bash
#判斷輸入是否為數字

read -p "輸入字符:" in
if [ -z $in ];then #當沒有輸入時直接退出
    exit 0
fi

#判斷輸入是否為數字
expr $in "+" 10 &> /dev/null
if [ $? -ne 0 ];then
	echo "輸入的不是數字"
else 
	echo "是數字"
fi

exit 0
```
![](https://img.kancloud.cn/97/92/9792d5916b30b92db0a690ded9e5bd5e_386x180.png)

也可以
```
#!/bin/bash

clear
read in
y=$(echo "$in" | sed 's/[0-9]//g')
if [ -z "$y" ];then
	echo "是數字"
else
	echo "不是數字"
fi
```








                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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