# Nix Garbage

## Nixos generations

Deleting old generations tldr: nix profile history

Simplest strategy go to /nix/var/nix/profiles/ delete symlinks, then run nix store gc.

Could be nice to make an interactive in oizys to choose profiles, delete profiles, then ask about garbage collection.

Help:

• man nix3-profile-history
• man nix3-profile-wipe-history

## Finding GC roots

To see why a path in the nix-store isn’t being deleted:

1. Use nix-store --query --referrers /nix/store/path
2. Check for live references with nix-store --gc --print-roots
3. Examine GC roots in /nix/var/nix/gcroots/
4. Look for indirect roots with nix-store --indirect --add-root

These commands will help identify what’s keeping the path alive.