website: improved command docs
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@ -13,6 +13,12 @@ perform new functionality.
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Prior to reading this page, it is assumed you have read the page on
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[plugin development basics](/docs/extend/developing-plugins.html).
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Command plugins implement the `packer.Command` interface and are served
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using the `plugin.ServeCommand` function. Commands actually have no control
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over what keyword invokes the command with the `packer` binary. The keyword
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to invoke the command depends on how the plugin is installed and configured
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in the core Packer configuration.
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<div class="alert alert-block">
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<strong>Warning!</strong> This is an advanced topic. If you're new to Packer,
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we recommend getting a bit more comfortable before you dive into writing
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