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add documentation of tarball-ttl to nix-channel

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Jade Lynn Masker 2025-05-31 17:50:46 -04:00
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doc/manual/source/command-ref/nix-channel.md
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@ -53,6 +53,11 @@ This command has the following operations:
Download the Nix expressions of subscribed channels and create a new generation.
Update all channels if none is specified, and only those included in *names* otherwise.
> **Note**
>
> `--update` uses [fetchTarball](@docroot@/language/builtins.md#builtins-fetchTarball) under the hood, so it will cache channels.
> Use `--tarball-ttl` or the nix configuration option `tarball-ttl` to change this behavior.
- `--list-generations`
Prints a list of all the current existing generations for the