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nix-super/doc/manual/source/command-ref/nix-env/switch-generation.md

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Split nix-env and nix-store documentation per-subcommand Documentation on "classic" commands with many sub-commands are notoriously hard to discover due to lack of overview and anchor links. Additionally the information on common options and environment variables is not accessible offline in man pages, and therefore often overlooked by readers. With this change, each sub-command of nix-store and nix-env gets its own page in the manual (listed in the table of contents), and each own man page. Also, man pages for each subcommand now (again) list common options and environment variables. While this makes each page quite long and some common parameters don't apply, this should still make it easier to navigate as that additional information was not accessible on the command line at all. It is now possible to run 'nix-store --<subcommand> --help` to display help pages for the given subcommand. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
2023-03-23 17:27:41 +02:00
# 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
Convert short nix options to long ones e.g. nix-env -e subversion => nix-env --uninstall subversion The aim is to make the documentation less cryptic for newcomers and the long options are more self-documenting. The change was made with the following script: <https://github.com/aschmolck/convert-short-nix-opts-to-long-ones> and sanity checked visually.
2023-04-30 16:52:38 +03:00
$ nix-env --switch-generation 42
Split nix-env and nix-store documentation per-subcommand Documentation on "classic" commands with many sub-commands are notoriously hard to discover due to lack of overview and anchor links. Additionally the information on common options and environment variables is not accessible offline in man pages, and therefore often overlooked by readers. With this change, each sub-command of nix-store and nix-env gets its own page in the manual (listed in the table of contents), and each own man page. Also, man pages for each subcommand now (again) list common options and environment variables. While this makes each page quite long and some common parameters don't apply, this should still make it easier to navigate as that additional information was not accessible on the command line at all. It is now possible to run 'nix-store --<subcommand> --help` to display help pages for the given subcommand. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
2023-03-23 17:27:41 +02:00
switching from generation 50 to 42
```
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