bash 如何将所有文件重命名为小写？
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How do I rename all files to lowercase?
提问by Voloda2
I have for example TREE.wav, ONE.WAV. I want to rename it to tree.wav, one.wav. How do I rename all files to lowercase?
我有例如 TREE.wav、ONE.WAV。我想把它重命名为tree.wav，one.wav。如何将所有文件重命名为小写？
回答by wjl
If you're comfortable with the terminal:
如果您对终端感到满意：
- Open Terminal.app, type
cdand then drag and drop the Folder containing the files to be renamed into the window. - To confirm you're in the correct directory, type
lsand hit enter. Paste this code and hit enter:
for f in *; do mv "$f" "$f.tmp"; mv "$f.tmp" "`echo $f | tr "[:upper:]" "[:lower:]"`"; done- To confirm that all your files are lowercased, type
lsand hit enter again.
- 打开 Terminal.app，输入
cd包含要重命名的文件的文件夹，然后将其拖放到窗口中。 - 要确认您位于正确的目录中，请键入
ls并按 Enter。 粘贴此代码并按回车键：
for f in *; do mv "$f" "$f.tmp"; mv "$f.tmp" "`echo $f | tr "[:upper:]" "[:lower:]"`"; done- 要确认您的所有文件都是小写的，请
ls再次键入并按 Enter。
(Thanks to @bavarious on twitter for a few fixes, and thanks to John Whitley below for making this safer on case-insensitive filesystems.)
（感谢 twitter 上的 @bavarious 进行了一些修复，并感谢下面的 John Whitley 使这在不区分大小写的文件系统上更安全。）
回答by Alex Harvey
The question as-asked is general, and also important, so I wish to provide a more general answer:
问的问题很笼统，也很重要，所以我想提供一个更笼统的答案：
Simplest case (safe most of the time, and on Mac OS X, but read on):
最简单的情况（大多数情况下是安全的，在 Mac OS X 上，但请继续阅读）：
for i in * ; do j=$(tr '[:upper:]' '[:lower:]' <<< "$i") ; mv "$i" "$j" ; done
You need to also handle spaces in filenames (any OS):
您还需要处理文件名中的空格（任何操作系统）：
IFS=$'\n' ; for i in * ; do j=$(tr '[:upper:]' '[:lower:]' <<< "$i") ; mv "$i" "$j" ; done
You need to safely handle filenames that differ only by case in a case-sensitive filesystem and not overwrite the target (e.g. Linux):
您需要安全地处理在区分大小写的文件系统中仅因大小写而异的文件名，而不是覆盖目标（例如 Linux）：
for i in * ; do j=$(tr '[:upper:]' '[:lower:]' <<< "$i") ; [ -e "$j" ] && continue ; mv "$i" "$j" ; done
Note about Mac OS X:
关于 Mac OS X 的注意事项：
Mac's filesystem is case-insensitive, case-preserving.
Mac 的文件系统不区分大小写，保留大小写。
There is, however, no need to create temporary files, as suggested in the accepted answer and comments, because two filenames that differ only by case cannot exist in the first place, ref.
但是，正如接受的答案和评论中所建议的那样，不需要创建临时文件，因为首先不能存在两个仅因大小写不同的文件名ref。
To show this:
要显示这一点：
$ mkdir test
$ cd test
$ touch X x
$ ls -l
total 0
-rw-r--r-- 1 alexharvey wheel 0 26 Sep 20:20 X
$ mv X x
$ ls -l
total 0
-rw-r--r-- 1 alexharvey wheel 0 26 Sep 20:20 x
回答by arsenius
A fish shell version:
一个鱼壳版本：
for old in *
set new (echo $old | tr '[A-Z]' '[a-z]')
mv $old $new
end
