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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.
The generations can be a list of generation numbers, the special value
`old` to delete all non-current generations, a value such as `30d` to
delete all generations older than the specified number of days (except
for the generation that was active at that point in time), or a value
such as `+5` to keep the last `5` generations ignoring any newer than
current, e.g., if `30` is the current generation `+5` will delete
generation `25` and all older generations. Periodically deleting old
generations is important to make garbage collection effective.
{{#include ./opt-common.md}}
{{#include ../opt-common.md}}
{{#include ./env-common.md}}
{{#include ../env-common.md}}
# Examples
```console
$ nix-env --delete-generations 3 4 8
```
```console
$ nix-env --delete-generations +5
```
```console
$ nix-env --delete-generations 30d
```
```console
$ nix-env -p other_profile --delete-generations old
```
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