nix-env --rollback Command

doc/manual/source/command-ref/nix-env/rollback.md

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# Name

`nix-env --rollback` - set user environment to previous generation

# Synopsis

`nix-env` `--rollback`

# Description

This operation switches to the “previous” generation of the active
profile, that is, the highest numbered generation lower than the current
generation, if it exists. It is just a convenience wrapper around
`--list-generations` and `--switch-generation`.

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# Examples

```console
$ nix-env --rollback
switching from generation 92 to 91
```

```console
$ nix-env --rollback
error: no generation older than the current (91) exists
```

Chunks

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Title: nix-env --rollback Command

Summary

The `nix-env --rollback` command allows users to revert their active user environment to the immediately preceding generation. It functions as a convenience wrapper, identifying the highest-numbered generation lower than the current one and switching to it. If no older generation exists, it will report an error.