如何从命令行批量重命名文件？

公理学

当我将文件从相机复制到计算机时，文件扩展名是大写的。我找到了这个问题和答案，但是建议的解决方案不起作用。

我的问题是，为什么建议的解决方案不起作用？如何重命名文件，使得我只能通过使扩展名变为小写来修改文件名？

注意：文件存储在NAS（Synology DS1813 +）上。

这是我尝试重命名文件：

$ ls
IMG_8809.JPG  IMG_8813.JPG  IMG_8817.JPG  IMG_8821.JPG  IMG_8825.JPG  IMG_8829.JPG  IMG_8833.JPG  IMG_8837.JPG  IMG_8841.JPG  IMG_8845.JPG  IMG_8849.JPG  Thumbs.db
IMG_8810.JPG  IMG_8814.JPG  IMG_8818.JPG  IMG_8822.JPG  IMG_8826.JPG  IMG_8830.JPG  IMG_8834.JPG  IMG_8838.JPG  IMG_8842.JPG  IMG_8846.JPG  IMG_8850.JPG
IMG_8811.JPG  IMG_8815.JPG  IMG_8819.JPG  IMG_8823.JPG  IMG_8827.JPG  IMG_8831.JPG  IMG_8835.JPG  IMG_8839.JPG  IMG_8843.JPG  IMG_8847.JPG  IMG_8851.JPG
IMG_8812.JPG  IMG_8816.JPG  IMG_8820.JPG  IMG_8824.JPG  IMG_8828.JPG  IMG_8832.JPG  IMG_8836.JPG  IMG_8840.JPG  IMG_8844.JPG  IMG_8848.JPG  IMG_8852.JPG
$ find . -name '*.*' -exec sh -c 'a=$(echo {} | sed -r "s/([^.]*)\$/\L\1/"); [ "$a" != "{}" ] && mv "{}" "$a" ' \;
mv: ‘./IMG_8835.JPG’ and ‘./IMG_8835.jpg’ are the same file
mv: ‘./IMG_8822.JPG’ and ‘./IMG_8822.jpg’ are the same file
mv: ‘./IMG_8830.JPG’ and ‘./IMG_8830.jpg’ are the same file
mv: ‘./IMG_8850.JPG’ and ‘./IMG_8850.jpg’ are the same file
mv: ‘./IMG_8820.JPG’ and ‘./IMG_8820.jpg’ are the same file
mv: ‘./IMG_8826.JPG’ and ‘./IMG_8826.jpg’ are the same file
mv: ‘./IMG_8847.JPG’ and ‘./IMG_8847.jpg’ are the same file
mv: ‘./IMG_8816.JPG’ and ‘./IMG_8816.jpg’ are the same file
mv: ‘./IMG_8819.JPG’ and ‘./IMG_8819.jpg’ are the same file
mv: ‘./IMG_8814.JPG’ and ‘./IMG_8814.jpg’ are the same file
mv: ‘./IMG_8810.JPG’ and ‘./IMG_8810.jpg’ are the same file
mv: ‘./IMG_8817.JPG’ and ‘./IMG_8817.jpg’ are the same file
mv: ‘./IMG_8809.JPG’ and ‘./IMG_8809.jpg’ are the same file
mv: ‘./IMG_8851.JPG’ and ‘./IMG_8851.jpg’ are the same file
mv: ‘./IMG_8844.JPG’ and ‘./IMG_8844.jpg’ are the same file
mv: ‘./IMG_8818.JPG’ and ‘./IMG_8818.jpg’ are the same file
mv: ‘./IMG_8823.JPG’ and ‘./IMG_8823.jpg’ are the same file
mv: ‘./IMG_8848.JPG’ and ‘./IMG_8848.jpg’ are the same file
mv: ‘./IMG_8842.JPG’ and ‘./IMG_8842.jpg’ are the same file
mv: ‘./IMG_8815.JPG’ and ‘./IMG_8815.jpg’ are the same file
mv: ‘./IMG_8837.JPG’ and ‘./IMG_8837.jpg’ are the same file
mv: ‘./IMG_8827.JPG’ and ‘./IMG_8827.jpg’ are the same file
mv: ‘./IMG_8825.JPG’ and ‘./IMG_8825.jpg’ are the same file
mv: ‘./IMG_8840.JPG’ and ‘./IMG_8840.jpg’ are the same file
mv: ‘./IMG_8812.JPG’ and ‘./IMG_8812.jpg’ are the same file
mv: ‘./IMG_8811.JPG’ and ‘./IMG_8811.jpg’ are the same file
mv: ‘./IMG_8836.JPG’ and ‘./IMG_8836.jpg’ are the same file
mv: ‘./IMG_8828.JPG’ and ‘./IMG_8828.jpg’ are the same file
mv: ‘./IMG_8832.JPG’ and ‘./IMG_8832.jpg’ are the same file
mv: ‘./IMG_8839.JPG’ and ‘./IMG_8839.jpg’ are the same file
mv: ‘./IMG_8831.JPG’ and ‘./IMG_8831.jpg’ are the same file
mv: ‘./IMG_8824.JPG’ and ‘./IMG_8824.jpg’ are the same file
mv: ‘./IMG_8813.JPG’ and ‘./IMG_8813.jpg’ are the same file
mv: ‘./IMG_8843.JPG’ and ‘./IMG_8843.jpg’ are the same file
mv: ‘./IMG_8846.JPG’ and ‘./IMG_8846.jpg’ are the same file
mv: ‘./IMG_8829.JPG’ and ‘./IMG_8829.jpg’ are the same file
mv: ‘./IMG_8821.JPG’ and ‘./IMG_8821.jpg’ are the same file
mv: ‘./IMG_8838.JPG’ and ‘./IMG_8838.jpg’ are the same file
mv: ‘./IMG_8833.JPG’ and ‘./IMG_8833.jpg’ are the same file
mv: ‘./IMG_8834.JPG’ and ‘./IMG_8834.jpg’ are the same file
mv: ‘./IMG_8845.JPG’ and ‘./IMG_8845.jpg’ are the same file
mv: ‘./IMG_8841.JPG’ and ‘./IMG_8841.jpg’ are the same file
mv: ‘./IMG_8852.JPG’ and ‘./IMG_8852.jpg’ are the same file
mv: ‘./IMG_8849.JPG’ and ‘./IMG_8849.jpg’ are the same file
$ ls
IMG_8809.JPG  IMG_8813.JPG  IMG_8817.JPG  IMG_8821.JPG  IMG_8825.JPG  IMG_8829.JPG  IMG_8833.JPG  IMG_8837.JPG  IMG_8841.JPG  IMG_8845.JPG  IMG_8849.JPG  Thumbs.db
IMG_8810.JPG  IMG_8814.JPG  IMG_8818.JPG  IMG_8822.JPG  IMG_8826.JPG  IMG_8830.JPG  IMG_8834.JPG  IMG_8838.JPG  IMG_8842.JPG  IMG_8846.JPG  IMG_8850.JPG
IMG_8811.JPG  IMG_8815.JPG  IMG_8819.JPG  IMG_8823.JPG  IMG_8827.JPG  IMG_8831.JPG  IMG_8835.JPG  IMG_8839.JPG  IMG_8843.JPG  IMG_8847.JPG  IMG_8851.JPG
IMG_8812.JPG  IMG_8816.JPG  IMG_8820.JPG  IMG_8824.JPG  IMG_8828.JPG  IMG_8832.JPG  IMG_8836.JPG  IMG_8840.JPG  IMG_8844.JPG  IMG_8848.JPG  IMG_8852.JPG

我还尝试了以下命令，结果相同：

$ rename s/.JPG/.jpg/ *.JPG
IMG_8809.JPG not renamed: IMG_8809.jpg already exists
IMG_8810.JPG not renamed: IMG_8810.jpg already exists
IMG_8811.JPG not renamed: IMG_8811.jpg already exists
IMG_8812.JPG not renamed: IMG_8812.jpg already exists
IMG_8813.JPG not renamed: IMG_8813.jpg already exists
IMG_8814.JPG not renamed: IMG_8814.jpg already exists
IMG_8815.JPG not renamed: IMG_8815.jpg already exists
IMG_8816.JPG not renamed: IMG_8816.jpg already exists
IMG_8817.JPG not renamed: IMG_8817.jpg already exists
IMG_8818.JPG not renamed: IMG_8818.jpg already exists
IMG_8819.JPG not renamed: IMG_8819.jpg already exists
IMG_8820.JPG not renamed: IMG_8820.jpg already exists
IMG_8821.JPG not renamed: IMG_8821.jpg already exists
IMG_8822.JPG not renamed: IMG_8822.jpg already exists
IMG_8823.JPG not renamed: IMG_8823.jpg already exists
IMG_8824.JPG not renamed: IMG_8824.jpg already exists
IMG_8825.JPG not renamed: IMG_8825.jpg already exists
IMG_8826.JPG not renamed: IMG_8826.jpg already exists
IMG_8827.JPG not renamed: IMG_8827.jpg already exists
IMG_8828.JPG not renamed: IMG_8828.jpg already exists
IMG_8829.JPG not renamed: IMG_8829.jpg already exists
IMG_8830.JPG not renamed: IMG_8830.jpg already exists
IMG_8831.JPG not renamed: IMG_8831.jpg already exists
IMG_8832.JPG not renamed: IMG_8832.jpg already exists
IMG_8833.JPG not renamed: IMG_8833.jpg already exists
IMG_8834.JPG not renamed: IMG_8834.jpg already exists
IMG_8835.JPG not renamed: IMG_8835.jpg already exists
IMG_8836.JPG not renamed: IMG_8836.jpg already exists
IMG_8837.JPG not renamed: IMG_8837.jpg already exists
IMG_8838.JPG not renamed: IMG_8838.jpg already exists
IMG_8839.JPG not renamed: IMG_8839.jpg already exists
IMG_8840.JPG not renamed: IMG_8840.jpg already exists
IMG_8841.JPG not renamed: IMG_8841.jpg already exists
IMG_8842.JPG not renamed: IMG_8842.jpg already exists
IMG_8843.JPG not renamed: IMG_8843.jpg already exists
IMG_8844.JPG not renamed: IMG_8844.jpg already exists
IMG_8845.JPG not renamed: IMG_8845.jpg already exists
IMG_8846.JPG not renamed: IMG_8846.jpg already exists
IMG_8847.JPG not renamed: IMG_8847.jpg already exists
IMG_8848.JPG not renamed: IMG_8848.jpg already exists
IMG_8849.JPG not renamed: IMG_8849.jpg already exists
IMG_8850.JPG not renamed: IMG_8850.jpg already exists
IMG_8851.JPG not renamed: IMG_8851.jpg already exists
IMG_8852.JPG not renamed: IMG_8852.jpg already exists

编辑

看到这个问题的文件系统和区分大小写的问题。

公理学

一位朋友指出了这一点。链接的文章长达8页，但其解释冗长。答案的简短版本是：

... And that brings me to what I really want to discuss, which is how 
CIFS Server (Samba) deals with this.

As you would expect from an application that was grown to bridge 
the gap between the Unix and Windows worlds, it is very flexible. 
This is both good and bad - with flexibility comes responsibility, 
and sometimes not a little confusion. There are four configuration 
options that Samba provides to allow one to define its behavior 
when dealing with matters of 'case': 

preserve case = (yes/no) 
short preserve case = (yes/no) 
default case = (upper/lower) 
case sensitive = (yes/no)

解决方案是将Samba配置为以适合您的特定需求的方式处理区分大小写（或区分大小写问题）。

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