[JENKINS-40811] output of batch step is truncated

This is somewhat hard to reproduce.

Sometimes the output of a bat step is truncated. Given the following pipeline script :

node("Windows") {

    def output = bat returnStdout: true, script: "some_program"

    echo output

}

some_program outputs a file path, say C:\Jenkins\workspace\Project\file.zip

Instead, this prints something like C:\Jenk or C:\Jenkins\workspace\Project\fil for instance.

I use the following work around

node("Windows") {

    bat script: "some_program > stdout"

    def output = readFile("stdout")

    echo output

}

Which always work.

---
Originally reported by cblegare, imported from: output of batch step is truncated

• status: Open
  
• priority: Major
  
• component(s): durable-task-plugin
  
• label(s): triaged-2018-11, windows
  
• resolution: Unresolved
  
• votes: 1
  
• watchers: 4
  
• imported: 2025-12-09
  

Raw content of original issue

This is somewhat hard to reproduce.


Sometimes the output of a bat step is truncated.  Given the following pipeline script :




node("Windows") {

    def output = bat returnStdout: true, script: "some_program"

    echo output

}





some_program outputs a file path, say C:\Jenkins\workspace\Project\file.zip


Instead, this prints something like C:\Jenk or C:\Jenkins\workspace\Project\fil for instance.


I use the following work around




node("Windows") {

    bat script: "some_program > stdout"

    def output = readFile("stdout")

    echo output

}





Which always work.

environment

```
Jenkins ver. 1.658

Durable Task Plugin 1.12

Windows Slaves (got the bug on Windows 7 and Windows 10)
```