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# Name
`nix-env --switch-generation` - set user environment to given profile generation
# Synopsis
`nix-env` {`--switch-generation` | `-G`} *generation*
# Description
This operation makes generation number *generation* the current
generation of the active profile. That is, if the `profile` is the path
to the active profile, then the symlink `profile` is made to point to
`profile-generation-link`, which is in turn a symlink to the actual user
environment in the Nix store.
Switching will fail if the specified generation does not exist.
{{#include ./opt-common.md}}
{{#include ../opt-common.md}}
{{#include ./env-common.md}}
{{#include ../env-common.md}}
# Examples
```console
$ nix-env -G 42
switching from generation 50 to 42
```
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