英文:
replacing files names with split output
问题
$files = Get-ChildItem -Path C:\Test
write-output $files
Directory: C:\Test
1_N04532L_LEFT.JPG
2_N04532R_RIGHT.JPG
code continues
foreach ($file in $files)
{
$nameArray = $file -split "_"
$newName = $nameArray[1]
write-output $newName
}
N04532L
N04532R
有没有办法实现这个？我不是程序员，网上有很多信息，但对我来说没用。
英文:
I am trying to use PowerShell to read filenames from a dir;
then within a for loop:
split names using a delimiter; store desired output in a new variable. Now I want to replace the original filenames in the directory with this new variable. So far I have gathered the following with the expected outputs shown:
$files = Get-ChildItem -Path C:\Test
write-output $files
Directory: C:\Test
1_N04532L_LEFT.JPG
2_N04532R_RIGHT.JPG
code continues
foreach ($file in $files)
{
$nameArray = $file -split "_"
$newName = $nameArray[1]
write-output $newName
}
N04532L
N04532R
Any Ideas on how to accomplish this. I am not a programmer and there is lots of data on this, but it's not working for me.
答案1
得分: 0
如两位评论者已经解释过的那样，可以使用Rename-Item cmdlet来重命名文件。由于此cmdlet可以在其NewName参数中接受一个脚本块，因此您可以使用它来创建一个新的文件名。
# 添加开关 -File 可以确保您不会尝试重命名子文件夹
$files = Get-ChildItem -Path 'C:\Test' -File
foreach ($file in $files) {
$file | Rename-Item -NewName { '{0}{1}' -f ($file.BaseName -split '_')[1], $file.Extension }
}
您可以通过将从Get-ChildItem获取的结果逐个传递给Rename-Item cmdlet来缩短此过程。因为在这里我们正在传递FileInfo对象，所以可以利用$_自动变量。
# 用括号括起Get-ChildItem cmd以便在将其传递给Rename-Item cmdlet之前完全枚举文件。
# 如果不这样做，您可能会再次捡起并处理已重命名的文件...
(Get-ChildItem -Path 'C:\Test' -File) |
Rename-Item -NewName { '{0}{1}' -f ($_.BaseName -split '_')[1], $_.Extension }
注意：在重命名文件时，您可能会遇到命名冲突，此时您将收到一个异常。
英文:
As both commenters already explained, there is the Rename-Item cmdlet for renaming files.
Since this cmdlet can take a scriptblock in its NewName parameter, you can use that to create a new filename.
# adding switch -File makes sure you do not also try to rename subfolders
$files = Get-ChildItem -Path 'C:\Test' -File
foreach ($file in $files) {
$file | Rename-Item -NewName { '{0}{1}' -f ($file.BaseName -split '_')[1], $file.Extension }
}
You can shorten this by piping the results from Get-ChildItem trhough one-by-one to the Rename-Item cmdlet.
Because we're piping the FileInfo objects here, we can make use of the $_ automatic variable
# enclose the Get-ChildItem cmd in brackets so this will enumerate the files to completion
# before passing them on to te Rename-Item cmdlet.
# if you don't, files you already have renamed could be picked up and processed again..
(Get-ChildItem -Path 'C:\Test' -File) |
Rename-Item -NewName { '{0}{1}' -f ($_.BaseName -split '_')[1], $_.Extension }
Note: when renaming files, you can always run into naming collisions, upon which you will receive an exception
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