重命名文件名中带有下划线的文件时shell出现意外行为

此命令将按预期生成十个文件：

for i in `seq 10`; do touch model; mv model model_$i; done

但是，此文件将只生成一个名为“model_”的文件：

---

文件名中的下划线似乎有一些影响，但实际发生了什么？感谢您的回答。

在您的第二个示例中，

$i_best

被解释为变量名，并可能扩展为空字符串

使用大括号和/或引号展开

$i

：

for i in `seq 10`; do 
    touch model_best     

    # just quote the variable (my favourite)
    mv model_best model_"$i"_best      

    # or (belt and braces approach, quotes can also go around the whole arg)
    # mv model_best model_"${i}"_best

    # or just curly braces
    # fine here since $i contains no spaces or glob characters 
    # (but I don't like it)
    # mv model_best model_${i}_best
done

---

谢谢你的解释。

for i in `seq 10`; do 
    touch model_best     

    # just quote the variable (my favourite)
    mv model_best model_"$i"_best      

    # or (belt and braces approach, quotes can also go around the whole arg)
    # mv model_best model_"${i}"_best

    # or just curly braces
    # fine here since $i contains no spaces or glob characters 
    # (but I don't like it)
    # mv model_best model_${i}_best
done