Nix 2.30.0
Nix, the purely functional package manager; unstable internal interfaces
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R""(
Roll back your default profile to the previous version:
Switch your default profile to version 510:
This command switches a profile to the most recent version older than the currently active version, or if --to N is given, to version N of the profile. To see the available versions of a profile, use nix profile history.
)""