appending to a file via shell redirecting (echo foo >> bar) replaces content from start of document, doesn't append

[cloph]

Windows Version

Microsoft Windows [Version 10.0.22635.3930]

WSL Version

2.3.11.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

6.6.36.3-microsoft-standard-WSL2

Distro Version

N/A (Almalinux, Mageia, doesn't make a difference)

Other Software

git-bash or cmd (i.e. run commands via wsl.exe from another shell/env)

Repro Steps

re-filing of #4400 that was closed due to inactivity, but the problem remains:
This is with git-bash, but just replace cat with type for trying with cmd

$ wsl.exe echo foo >> output
$ cat output
foo
$ wsl.exe echo barbazlonger >> output
$ cat output
barbazlonger
$ wsl.exe echo foo >> output
$ cat output
foo
azlonger

Expected Behavior

expected output is a file with following content:

foo
barbazlonger
foo

Actual Behavior

instead of appending, the redirection starts to replace from the start of the file, breaking all expectations.

Diagnostic Logs

No response

[github-actions]

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Download and execute collect-wsl-logs.ps1 in an administrative powershell prompt:

Invoke-WebRequest -UseBasicParsing "https://raw.githubusercontent.com/microsoft/WSL/master/diagnostics/collect-wsl-logs.ps1" -OutFile collect-wsl-logs.ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
.\collect-wsl-logs.ps1

The scipt will output the path of the log file once done.

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View similar issues

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Open similar issues:

• Append with file redirection not working running linux tools from Windows command line (#4400), similarity score: 0.76

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[cloph]

WslLogs-2024-07-18_15-05-42.zip

[github-actions]

Diagnostic information

Detected appx version: 2.3.11.0