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# Name
`nix-env --delete-generations` - delete profile generations
# Synopsis
`nix-env` `--delete-generations` *generations*
# Description
This operation deletes the specified generations of the current profile.
*generations* can be a one of the following:
- <span id="generations-list">`<number>...`</span>:\
A list of generation numbers, each one a separate command-line argument.
Delete exactly the profile generations given by their generation number.
Deleting the current generation is not allowed.
- The special value <span id="generations-old">`old`</span>
Delete all generations except the current one.
> **WARNING**
>
> Older *and newer* generations will be deleted by this operation.
>
> One might expect this to just delete older generations than the curent one, but that is only true if the current generation is also the latest.
> Because one can roll back to a previous generation, it is possible to have generations newer than the current one.
> They will also be deleted.
- <span id="generations-time">`<number>d`</span>:\
The last *number* days
*Example*: `30d`
Delete all generations created more than *number* days ago, except the most recent one of them.
This allows rolling back to generations that were available within the specified period.
- <span id="generations-count">`+<number>`</span>:\
The last *number* generations up to the present
*Example*: `+5`
Keep the last *number* generations, along with any newer than current.
Periodically deleting old generations is important to make garbage collection
effective.
The is because profiles are also garbage collection roots — any [store object] reachable from a profile is "alive" and ineligible for deletion.
[store object]: @docroot@/glossary.md#gloss-store-object
{{#include ./opt-common.md}}
{{#include ../opt-common.md}}
{{#include ./env-common.md}}
{{#include ../env-common.md}}
# Examples
## Delete explicit generation numbers
```console
$ nix-env --delete-generations 3 4 8
```
Delete the generations numbered 3, 4, and 8, so long as the current active generation is not any of those.
## Keep most-recent by count (number of generations)
```console
$ nix-env --delete-generations +5
```
Suppose `30` is the current generation, and we currently have generations numbered `20` through `32`.
Then this command will delete generations `20` through `25` (`<= 30 - 5`),
and keep generations `26` through `31` (`> 30 - 5`).
## Keep most-recent by time (number of days)
```console
$ nix-env --delete-generations 30d
```
This command will delete all generations older than 30 days, except for the generation that was active 30 days ago (if it currently exists).
## Delete all older
```console
$ nix-env --profile other_profile --delete-generations old
```
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