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This article mainly introduces how to change the suffix when the PowerShell file name contains []. The article is very detailed and has certain reference value. Interested friends must read it!

demand

The well-known problem is that the way video sites publish videos has changed a lot. For example, MP4 file renamed MP41, similar to the following

PS E:\BaiduNetdiskDownload> ls *.mp41 -Recurse Record: E:\BaiduNetdiskDownloadMode LastWriteTime Length Name ---- ------------- ------ ---- -a---- 2019/8/11 20:42 1322066936 [SUBPIG][Eien no Nispa SP].mp41

However, according to the actual

[SUBPIG][Eien no Nispa SP].mp41

This file name, with rename to modify the way, but was prompted to fail.

PS E:\BaiduNetdiskDownload> Rename-Computer "[SUBPIG][Eien no Nispa SP].mp41" "[SUBPIG][Eien no Nispa SP].mp4"Rename-Computer : Could not find positional form parameter that accepts actual parameter "[SUBPIG][Eien no Nispa SP].mp4". Location Line:1 Character: 1+ Rename-Computer "[SUBPIG][Eien no Nispa SP].mp41" "[SUBPIG][Eien no N...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidArgument: (:) [Rename-Computer]，ParameterBindingException + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.RenameComputerCommand autocomplete

Why is that? In fact, the reason is very simple, because PowerShell has a special definition for the [] symbol, so it cannot be written like this.

Let's try running it directly from the command line, and the system will automatically fill in what character escapes

PS E:\BaiduNetdiskDownload> & '.\ [SUBPIG][Eien no Nispa SP].mp41'

You can see that the string is preceded by an ampersand followed by a space, and the string is surrounded by '(single quotes). This method can be used to run command-line tools or executable programs that contain special characters, but it is not used when passing parameters.

Let's try specifying a path or file name in one of the parameters and see what the system automatically completes.

PS E:\BaiduNetdiskDownload> Rename-Item -Path '.\` [SUBPIG`]`[Eien no Nispa SP`].mp41'

This is probably the correct way to write a function.

function EscapeWord ($param1) { if ($param1 -match "[[]" -or $param1 -match "[]]") { $param1.replace('[', '`[').replace(']', '`]') }}EscapeWord "E:\BaiduNetdiskDownload\[SUBPIG][FAKE AFFAIR EP05].mp41"E:\BaiduNetdiskDownload\`[SUBPIG`]`[FAKE AFFAIR EP05`].mp41

First, a single piece of data is executed.

PS E:\BaiduNetdiskDownload> Rename-Item -Path '.\` [SUBPIG`]`[Eien no Nispa SP`].mp41' -NewName '.\` [SUBPIG`]`[Eien no Nispa SP`].mp4' Rename-Item : Object under specified path E:\BaiduNetdiskDownload\`[SUBPIG`]`[Eien no Nispa SP`].mp41 does not exist.

Actually, it failed.

work around

It is really speechless, since [] has been redefined under PowerShell, it is always good under CMD. Mix it with CMD. This time I cut the name string, cutting off the last string, and replacing the name. The requirements can still be met, and the modification record is saved additionally in a file.

(Get-ChildItem *.mp41 -Recurse) | ForEach-Object { $fullname = $_.fullname $fullname $NewName = $_.name $NewName = ($NewName[0.. ($NewName.Length - 2)] -join "") $NewName $info = "rename `"$fullname`" `"$NewName`"" cmd /c $info $info | Out-File c:\333.txt -Append -Force -Encoding utf8}

highlight test

final plan

The problem is solved, but the implementation method is too twisted. If there is a native method, the above operation will not be considered.

I searched for keywords

rename file PowerShell match []

I found the following ultimate solution at my employer.

https://answers.microsoft.com/en-us/windows/forum/windows_10-files/how-to-rename-image-files-in-a-folder-all-to-jpg/2a7e2873-e04b-472b-b239-afad2f2020fc

If you can't solve it, it's a sharp weapon to go directly to. net.

Get-ChildItem *.mp41 -Recurse | Rename-Item -newname { [io.path]::ChangeExtension($_.name, "mp4") }

I also found an interesting alternative at https://stackoverflow.com/questions/5574648/use-regex-powershell-to-rename-files, but the same, limited to [], doesn't quite fit my scenario.

Get-ChildItem *.mp41 |ForEach-Object{ Rename-Item $_ $(($_.name -replace '^filename_+','') -replace '_+','') } The above is "How to change suffix when PowerShell filename contains []" All the contents of this article, thank you for reading! Hope to share the content to help everyone, more relevant knowledge, welcome to pay attention to the industry information channel!

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