PowerShell locking File

I am trying to do something very simple in PowerShell.

  1. Reading the contents of a file
  2. Manipulation some string
  3. Saving the modified test back to the file

    function Replace {
      $file = Get-Content C:\Path\File.cs
      $file | foreach {$_ -replace "document.getElementById", "$"} |out-file -filepath C:\Path\File.cs
    }
    

I have tried Set-Content as well.

I always get unauthorized exception. I can see the $file has the file content, error is coming while writing the file.

How can I fix this?

This is likely caused by the Get-Content cmdlet that gets a lock for reading and Out-File that tries to get its lock for writing. Similar question is here: Powershell: how do you read & write I/O within one pipeline?

So the solution would be:

${C:\Path\File.cs} = ${C:\Path\File.cs} | foreach {$_ -replace "document.getElementById", '$'}
${C:\Path\File.cs} = Get-Content C:\Path\File.cs | foreach {$_ -replace  "document.getElementById", '$'}

$content = Get-Content C:\Path\File.cs | foreach {$_ -replace "document.getElementById", '$'}
$content | Set-Content C:\Path\File.cs

Basically you need to buffer the content of the file so that the file can be closed (Get-Content for reading) and after that the buffer should be flushed to the file (Set-Content, during that write lock will be required).

Checking for a Locked File Using PowerShell -- Microsoft Certified , (I do want to note that if you use Notepad to open up a file, it will not actually lock the file even though you can clearly see it being used. For some� Thanks Vasili, As I am new to powershell can you please help more by little elaborate your syntax. Also we don't know the exact file name. It just new files are continuously coming to a folder and we don't want those files to be moved before there writing got finished or not fully received. – Deepak Jan 14 '14 at 5:35

The accepted answer worked for me if I had a single file operation, but when I did multiple Set-Content or Add-Content operations on the same file, I still got the "is being used by another process" error.

In the end I had to write to a temp file, then copy the temp file to the original file:

(Get-Content C:\Path\File.cs) | foreach {$_ -replace "document.getElementById", '$'} | Set-Content C:\Path\File.cs.temp
Copy-Item C:\Path\File.cs.temp C:\Path\File.cs

How do I lock a file and prevent others read or write from the file , $file.Close(). The file c:\files\diff.txt is locked for read and write until you press a key. Once you press a key and release the lock, others can access the file again. Unfortunately, Windows PowerShell nor the.NET Framework expose a simple way of determining which process is locking the file. Determine which process is locking the file requires quite a few steps to interrogate the system. This can be accomplished by using a set of Windows API calls and Platform Invoke (PInvoke) functionality.

Personal experience: I had the "locked file syndrome" in one of my procedures. I found it was caused by a New-Object assignment on the file. I realised that I had not issued a "Dispose()" call on the object. I rewrote the offending code to dispose of the 'New-Object' as soon as convenient and the "locked file" syndrome was resolved. A learning event for me = always dispose of each New-Object!

How to purposefully exclusively lock a file?, Lock a file without 3rd party tools, no changes to the file being locked and file can' t even be copied. This PowerShell script is a quote from an answer to a similar� I would like to create a powershell script which can tell of show me who (username) is locking the file. I have looked at openfiles /query but the file is on a fileserver so the search takes up a lot of resources and long time to find it.

File Locking : PowerShell, Net StreamReader and StreamWriter do exactly what you want. # Create a destination file (and lock it) $Stream = [System.IO.StreamWriter]::New('D:\Test.txt � Is there a reason that you need to use both openfiles.exe and net file? Below is a function that uses only net file and wraps it around a PowerShell Script.. To use it, you can copy the whole code, and paste it into a PowerShell session.

How to implement a file based locking mechanism within a , The following code enables a file based locking mechanism within a powershell script. It checks for existance of a lock file and checks if a� Get-Process | Out-File -FilePath E:\reports\processes.txt. The command will execute and create processes.txt file. The output is shown in the second image below: How to Append PowerShell Output to an existing Text File with Out-File. Another way to use PowerShell to write to file is to append output to an existing text file with content.

Script How to find out which process is locking a file or folder in , This sample demonstrates how to find out which process is locking a file or folder in Windows. This sample demonstrates how to find out which process is locking a file or folder in Windows. Script How to find out which process is locking a file or folder in Windows This site uses cookies for analytics, personalized content and ads.

Comments
  • Does this fail for all files or just that one or in that path?
  • It worked. Thanks. Now I feel stupid for asking this :) but thanks. I did read about this but since I was piping everything in one statement it gave me error as the lock was not released. Cool!!
  • I don't understand the solution - I have an xml file via [xml]$file = Get-Content $filename and when I attempt to delete the file after read it, I get the locking error. There's no dispose method on the XmlDocument and nulling $file doesn't work, so I'm not sure how to proceed.
  • Maybe the variable should be 'xml' [xml]$xml = Get-Content $filename. So it's clear, that it's not file, but object that represents xml. Remove-Item $filename deletes the file.