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# 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.
{{#include ./opt-common.md}}
{{#include ../opt-common.md}}
{{#include ./env-common.md}}
{{#include ../env-common.md}}
## Examples
The following updates a profile such that its current generation will
contain just Firefox:
```console
$ nix-env -p /nix/var/nix/profiles/browser --set firefox
```
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