blocks|key|3234072|text|尽管你已经发布了你自己的答案，但这里有一个变体：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3234073|dir+Leaflets+-r+%7C+%25+{+if+($_.Name+-cne+$_.Name.ToLower())+{+ren+$_.FullName+$_.Name.ToLower()+}+}|code-block|syntax|javascript|3234074|以下是一些要点：|3234075|3234076|dir是Get-ChildItem的别名(+ForEach-Object.|unordered-list-item|offset|length|style|BOLD|3234077|-cne是的别名，-r是的缩写)区分大小写。Object+Object忽略大小写differences.|3234078|$_是在for中引用当前项的方式每个对象loop.|3234079|ren是Rename-Item.|3234080|FullName的别名可能更好，因为它可以确保您将访问正确的文件。|3234081|3234082|如果您不想重命名目录，可以包括如下内容：|3234083|if+((!+$_.IsPsContainer)+-and+$_.Name+-cne+$_.Name.ToLower())+{+...+}|3234084|希望这对继续学习和探索PowerShell有帮助。|3234085|entityMap^0|0|0|0|0|0|3|M|E|0|0|4|5|7|0|0|2|0|0|3|4|B|0|0|8|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|19|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1B|8|@$M|1C|N|1D|O|P]|$M|1E|N|1F|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1G|8|@$M|1H|N|1I|O|P]|$M|1J|N|1K|O|P]]|9|@]|A|$]]|$1|S|3|T|5|L|7|1L|8|@$M|1M|N|1N|O|P]]|9|@]|A|$]]|$1|U|3|V|5|L|7|1O|8|@$M|1P|N|1Q|O|P]|$M|1R|N|1S|O|P]]|9|@]|A|$]]|$1|W|3|X|5|L|7|1T|8|@$M|1U|N|1V|O|P]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1X|8|@]|9|@]|A|$]]|$1|11|3|12|5|D|7|1Y|8|@]|9|@]|A|$E|F]]|$1|13|3|14|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|15|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|16|$]]

Even though you have already posted your own answer, here is a variation:

<pre><code>dir Leaflets -r | % { if ($_.Name -cne $_.Name.ToLower()) { ren $_.FullName $_.Name.ToLower() } }
</code></pre>

Some points:

<ul>
<li>dir is an alias for Get-ChildItem (and -r is short for -Recurse).</li>
<li>% is an alias for ForEach-Object.</li>
<li>-cne is a case-sensitive comparison. -ne ignores case differences.</li>
<li>$_ is how you reference the current item in the ForEach-Object loop.</li>
<li>ren is an alias for Rename-Item.</li>
<li>FullName is probably preferred as it ensures you will be touching the right file.</li>
</ul>

If you wanted to excludes directories from being renamed, you could include something like:

<pre><code>if ((! $_.IsPsContainer) -and $_.Name -cne $_.Name.ToLower()) { ... }
</code></pre>

Hopefully this is helpful in continuing to learn and explore PowerShell.

blocks|key|3019766|text|请记住，您可以通过管道直接重命名项目，并使用带有-NewName参数的脚本块(因为它还接受管道输入)来简化此任务：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3019767|Get-ChildItem+-r+%7C+Where+{!$_.PSIsContainer}+%7C+
+++++++++++++++++++Rename-Item+-NewName+{$_.FullName.ToLower()}|code-block|syntax|javascript|3019768|和别名：|3019769|gci+-r+%7C+?{!$_.PSIsContainer}+%7C+rni+-New+{$_.FullName.ToLower()}|3019770|entityMap^0|P|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Keep in mind that you can pipe directly to Rename-Item and use Scriptblocks with the -<code>NewName</code> parameter (because it also accepts pipeline input) to simplify this task:

<pre><code>Get-ChildItem -r | Where {!$_.PSIsContainer} | 
 Rename-Item -NewName {$_.FullName.ToLower()}
</code></pre>

and with aliases:

<pre><code>gci -r | ?{!$_.PSIsContainer} | rni -New {$_.FullName.ToLower()}
</code></pre>

blocks|key|295744|text|对此稍作调整，如果您只想更新特定类型文件的名称，请尝试以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|295745|get-childitem+*.jpg+%7C+foreach+{+if+($_.Name+-cne+$_.Name.ToLower())+{+ren+$_.FullName+$_.Name.ToLower()+}+}|code-block|syntax|javascript|295746|这只会将文件夹中的jpg文件小写，而忽略其余文件|295747|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

slight tweak on this, if you only want to update the names of files of a particular type try this:

<pre><code>get-childitem *.jpg | foreach { if ($_.Name -cne $_.Name.ToLower()) { ren $_.FullName $_.Name.ToLower() } }
</code></pre>

this will only lowercase the jpg files within your folder and ignore the rest

blocks|key|298399|text|您需要暂时将它们重命名为其他名称，然后将它们重新命名为全部小写。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|298400|$items+=+get-childitem+-Directory+-Recurse

foreach+($item+in+$items)
{

+++if+($item.name+-eq+$item.name.ToLower())
+++{++++

+++++++$temp+=+$item.FullName.ToLower()+%2B+"_"
+++++++$name+=+$item.FullName.ToLower()
+++++++ren+$name+$temp

+++++++ren+$temp+$name
+++}|code-block|syntax|javascript|298401|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You need to temporarily rename them to something else then name them back all lower case.

<pre><code>$items = get-childitem -Directory -Recurse

foreach ($item in $items)
{

 if ($item.name -eq $item.name.ToLower())
 { 

 $temp = $item.FullName.ToLower() + "_"
 $name = $item.FullName.ToLower()
 ren $name $temp

 ren $temp $name
 }
</code></pre>

blocks|key|296485|text|由于Rename-Item、管道、循环和Windows文件系统工作方式的本质，前面给出的答案存在许多问题。不幸的是，我找到的将给定文件夹内的所有文件和文件夹重命名为小写的最简单的解决方案(这里没有使用别名)是这样的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|296486|Get-ChildItem+-Path+"/Path/To/You/Folder"+-Recurse+%7C+Where{+$_.Name+-cne+$_.Name.ToLower()+}+%7C+ForEach-Object+{+$tn="$($_.Name)-temp";+$tfn="$($_.FullName)-temp";+$nn=$_.Name.ToLower();+Rename-Item+-Path+$_.FullName+-NewName+$tn;+Rename-Item+-Path+$tfn+-NewName+$nn+-Force;+Write-Host+"New+Name:+$($nn)";}|code-block|syntax|javascript|296487|entityMap^0|2|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

There are many issues with the previous given answers due to the nature of how <code>Rename-Item</code>, Piping, Looping and the Windows Filesystem works. Unfortunatly the the most simple (not using aliases for readability here) solution I found to rename all files and folders inside of a given folder to lower-case is this one:

<pre><code>Get-ChildItem -Path "/Path/To/You/Folder" -Recurse | Where{ $_.Name -cne $_.Name.ToLower() } | ForEach-Object { $tn="$($_.Name)-temp"; $tfn="$($_.FullName)-temp"; $nn=$_.Name.ToLower(); Rename-Item -Path $_.FullName -NewName $tn; Rename-Item -Path $tfn -NewName $nn -Force; Write-Host "New Name: $($nn)";}
</code></pre>

blocks|key|3019912|text|这是对Jay+Bazuzi回答的一个小而重要的修正。如果where-part应返回任何内容，则必须使用-cne+(区分大小写不等于)运算符。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3019913|此外，我发现需要提供Path参数。此版本在我的设置中有效：|3019914|gci+-Recurse+%7C+
++++?+{+$_.Name+-cne+$_.Name.ToLower()+}+%7C+
++++%25+{+ren+$_.Name+-NewName+$_.Name.Tolower()++}|code-block|syntax|javascript|3019915|entityMap^0|1F|4|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

A small but important correction to the answer from Jay Bazuzi. The <code>-cne</code> (case sensitive not equal) operator must be used if the where-part should return anything.

Additionally I found that the Path parameter needed to be present. This version worked in my setup: 

<pre><code>gci -Recurse | 
 ? { $_.Name -cne $_.Name.ToLower() } | 
 % { ren $_.Name -NewName $_.Name.Tolower() }
</code></pre>

blocks|key|298443|text|对于关注这个主题的每个人，下面这行代码也可以用来降低文件和目录。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|298444|Get-ChildItem+-r++%7C+Rename-Item+-NewName+{+$_.Name.ToLower().Insert(0,'_')+}+-PassThru+%7C++Rename-Item+-NewName+{+$_.Name.Substring(1)+}|code-block|syntax|javascript|298445|主要帖子：https://stackoverflow.com/a/70559621/4165074|offset|length|298446|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/70559621/4165074^0|0|0|5|18|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

for everyone who is following this thread; the following line can also be used to lower both files and directories.
<pre><code>Get-ChildItem -r | Rename-Item -NewName { $_.Name.ToLower().Insert(0,'_') } -PassThru | Rename-Item -NewName { $_.Name.Substring(1) }
</code></pre>
Main post: <a href="https://stackoverflow.com/a/70559621/4165074">https://stackoverflow.com/a/70559621/4165074</a>

I am trying to rename a bunch of files recursively using Powershell 2.0. The directory structure looks like this:

<pre><code>Leaflets
+ HTML
 - File1
 - File2
 ...
+ HTMLICONS
 + IMAGES
 - Image1
 - Image2
 - File1
 - File2
 ...
+ RTF
 - File1
 - File2
 ...
+ SGML
 - File1
 - File2
 ...
</code></pre>

I am using the following command:

<pre><code>get-childitem Leaflets -recurse | rename -newname { $_.name.ToLower() }
</code></pre>

and it seems to rename the files, but complains about the subdirectories:

<pre><code>Rename-Item : Source and destination path must be different.
</code></pre>

I reload the data monthly using robocopy, but the directories do not change, so I can rename them by hand. Is there any way to get <code>get-children</code> to skip the subdirectories (like <code>find Leaflets -type f ...</code>)?

Thanks.

UPDATE: It appears that the problem is with files that are already all lower case. I tried changing the command to:

<pre><code>get-childitem Leaflets -recurse | if ($_.name -ne $_name.ToLower()) rename -newname { $_.name.ToLower() }
</code></pre>

but now Powershell complains that <code>if</code> is not a cmdlet, function, etc.
Can I pipe the output of <code>get-childitem</code> to an <code>if</code> statement?

UPDATE 2: This works:

<pre><code>$files=get-childitem Leaflets -recurse
foreach ($file in $files)
{
 if ($file.name -ne $file.name.ToLower())
 {
 rename -newname { $_.name.ToLower() }
 }
}
</code></pre>

Rename files to lowercase in Powershell

文件系统

Windows

我正在尝试使用Powershell2.0递归地重命名一堆文件。目录结构如下所示：Leaflets+ HTML  - File1  - File2  ...+ HTMLICONS  + IMAGES    - Image1    - Image2  - File1  - File2  ...+ RTF  - File1 ...

问在Powershell中将文件重命名为小写
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