EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Aug 9·5 min read
Tracking down a Zsh history data loss bug
TL;DR
A bug in Zsh caused users to lose recent command history, leading to frustration. The issue was identified and fixed in Zsh version 5.9.2, released on July 12, 2026.
✦ Why It Matters
Update to Zsh 5.9.2 to prevent command history loss and improve your workflow.
Key Takeaways
- Monitor file operations to diagnose data loss issues.
- Use tools like fatrace for process-level insights.
- Modify software to generate core dumps for debugging.
- Update to the latest software version to fix known bugs.
How It Works
The author used file monitoring tools to trace how Zsh interacted with the history file, discovering that it was rewriting the file incorrectly. By modifying Zsh to crash under specific conditions, they could analyze core dumps to identify the underlying bug in the savehistfile function.