nix-env-set - Man Page
Name
nix-env --set — set profile to contain a specified derivation
Synopsis
nix-env --set drvname
Description
The --set operation modifies the current generation of a profile so that it contains exactly the specified derivation, and nothing else.
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Examples
The following updates a profile such that its current generation will contain just Firefox:
$ nix-env --profile /nix/var/nix/profiles/browser --set firefox