lix/doc/manual/rl-next/fix-gc-dry-run.md

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---
synopsis: Fix nix-collect-garbage --dry-run
issues: [fj#432]
cls: [1566]
category: Fixes
credits: [quantumjump]
---
`nix-collect-garbage --dry-run` did not previously give any output - it simply
exited without even checking to see what paths would be deleted.
```
$ nix-collect-garbage --dry-run
$
```
We updated the behaviour of the flag such that instead it prints out how many
paths it *would* delete, but doesn't actually delete them.
```
$ nix-collect-garbage --dry-run
finding garbage collector roots...
determining live/dead paths...
...
<nix store paths>
...
2670 store paths deleted, 0.00MiB freed
$
```