add documentation of tarball-ttl to nix-channel
(cherry picked from commit 6badd21b6a)
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@@ -53,6 +53,11 @@ This command has the following operations:
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Download the Nix expressions of subscribed channels and create a new generation.
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Update all channels if none is specified, and only those included in *names* otherwise.
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> **Note**
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>
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> `--update` uses [fetchTarball](@docroot@/language/builtins.md#builtins-fetchTarball) under the hood, so it will cache channels.
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> Use `--tarball-ttl` or the nix configuration option `tarball-ttl` to change this behavior.
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- `--list-generations`
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Prints a list of all the current existing generations for the
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