The Problem

You open VS Code, fire up the integrated Git Bash terminal, and are immediately greeted with:

bash: uname: command not found
bash: sed: command not found
$

Git Bash works perfectly fine when you open it standalone outside of VS Code. Even basic commands like cat and ls might fail. Something about VS Code’s environment is breaking Git Bash’s ability to find its own utilities.

Why This Happens

This issue stems from VS Code’s shell integration system combined with extension interference. VS Code tries to inject shell integration scripts into your terminal to provide enhanced features like command tracking, git suggestions, and command decorations. These scripts expect a proper Unix-style PATH and use utilities like uname and sed.

On Windows, Git Bash uses MINGW64 and has its Unix utilities in /usr/bin. When VS Code extensions (particularly the Python extension) modify the terminal environment to activate virtual environments or inject their own scripts, they can corrupt the PATH or prevent bash from finding these utilities.

This is actually a known issue - VS Code Issue #269581 documents this exact problem and it’s been marked as a bug by the VS Code team.

The Diagnostic Approach

The key to solving this was systematic elimination:

1. Confirm It’s VS Code-Specific

First, verify that standalone Git Bash works fine. This confirms the issue is with VS Code’s configuration, not your Git Bash installation.

2. Identify the Shell Integration Script

Run this in standalone Git Bash:

code --locate-shell-integration-path bash

This reveals where VS Code’s shell integration script lives - typically in your VS Code installation directory.

3. Rule Out Your Own Config Files

Check if your bash startup files contain the problematic commands:

grep -r "uname" ~/.bashrc ~/.bash_profile ~/.profile
grep -r "sed" ~/.bashrc ~/.bash_profile ~/.profile

If these return nothing, you know your own config isn’t the culprit.

4. Test With Extensions Disabled

This is the crucial test:

code --disable-extensions

Launch VS Code with all extensions disabled. If the errors disappear, you know an extension is causing the problem.

5. Binary Search for the Culprit

Enable extensions one by one (or in groups) to identify which one breaks Git Bash. Start with the most likely suspects:

  • Python extension
  • Claude Code
  • GitHub Copilot
  • GitLens

In my case, the Python extension was the culprit.

The Solution

Once you’ve identified the Python extension as the problem, you need to prevent it from injecting its environment activation scripts into Git Bash.

Add these settings to your VS Code settings.json:

{
  "python.terminal.activateEnvironment": false,
  "python.terminal.executeInFileDir": false,
  "terminal.integrated.inheritEnv": false,
  "terminal.integrated.profiles.windows": {
    "Git Bash": {
      "path": "C:\\Users\\YourUsername\\AppData\\Local\\Programs\\Git\\bin\\bash.exe",
      "env": {
        "MSYSTEM": "MINGW64",
        "CHERE_INVOKING": "1"
      }
    }
  },
  "terminal.integrated.defaultProfile.windows": "Git Bash"
}

The critical settings are:

  • python.terminal.activateEnvironment: false - Prevents Python from auto-activating virtual environments in the terminal
  • MSYSTEM: "MINGW64" - Tells Git Bash which subsystem to use
  • CHERE_INVOKING: "1" - Ensures bash starts with the proper PATH

Why This Works

The Python extension tries to be helpful by automatically activating Python virtual environments when you open a terminal. However, its activation scripts expect a Unix-style environment and use commands like uname to detect the operating system. When these scripts run before Git Bash has properly initialized its PATH, they fail and pollute your terminal with error messages.

By disabling automatic environment activation, you prevent these scripts from running at startup. You can still manually activate virtual environments when needed with source venv/Scripts/activate, but your terminal will start cleanly.

Alternative Approaches

If you absolutely need automatic Python environment activation, consider:

  1. Use PowerShell for Python work - Create separate terminal profiles and use PowerShell when working with Python, Git Bash for git operations.

  2. Manually activate environments - Just run activation scripts yourself when needed rather than having them auto-run.

  3. Use WSL - Windows Subsystem for Linux provides a native Linux environment where these tools work more reliably.

Lessons Learned

This debugging experience reinforces a few key principles:

  1. Systematic elimination is your friend - Don’t guess; methodically narrow down the problem space.
  2. Check if it’s environment-specific - Always test whether the issue appears in other contexts.
  3. Extensions can have unintended side effects - Popular extensions that modify the environment can conflict in unexpected ways.
  4. Read the error messages literally - “command not found” really does mean the PATH is broken, not that the command doesn’t exist.

The beauty of this solution is that it’s minimal - we’re not disabling shell integration entirely or resorting to complex workarounds. We’re simply telling one extension to be less aggressive about modifying the terminal environment, which is the right balance between functionality and stability.

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