nix-env-rollback1
Set user environment to previous generation
Usage
nix-env --rollback
Overview
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
$ nix-env --rollback switching from generation 92 to 91
$ nix-env --rollback error: no generation older than the current (91) exists