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Merge pull request #13305 from donottellmetonottellyou/donottellmetonottellyou/document-nix-channel-tarball-ttl
add documentation of tarball-ttl to nix-channel
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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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> Downloaded channel contents are cached.
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> Use `--tarball-ttl` or the [`tarball-ttl` configuration option](@docroot@/command-ref/conf-file.md#conf-tarball-ttl) to change the validity period of cached downloads.
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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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