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