39 lines
1.7 KiB
Markdown
39 lines
1.7 KiB
Markdown
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---
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id: understanding-cli
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title: Understanding the CLI
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layout: docs
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category: Guides
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permalink: docs/understanding-cli.html
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next: upgrading
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previous: performance
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---
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Though you may have installed the `react-native-cli` via npm as a separate module, it is a shell for accessing the CLI embedded
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in the React Native of each project. Your commands and their effects are dependent on the version of the module of `react-native`
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in context of the project. This guide will give a brief overview of the CLI in the module.
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# The local CLI
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React Native has a [`local-cli`](https://github.com/facebook/react-native/tree/master/local-cli) folder with a file named
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[`cliEntry.js`](https://github.com/facebook/react-native/blob/master/local-cli/cliEntry.js). Here, the commands are read
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from `commands.js` and added as possible CLI commands. _E.G._ the `react-native link` command, exists in the
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[`react-native/local-cli/link`](https://github.com/facebook/react-native/blob/master/local-cli/link/) folder, and is
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required in `commands.js`, which will register it as a documented command to be exposed to the CLI.
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# Command definitions
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At the end of each command entry is an export. The export is an object with a function to perform, description of the command, and the command name. The object structure for the `unlink` command looks like so:
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```js
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module.exports = {
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func: link,
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description: 'links all native dependencies',
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name: 'link [packageName]',
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};
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```
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### Parameters
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The command name identifies the parameters that a command would expect. When the command parameter is surrounded by greater-than, less-than symbols `< >`, this indicates that the parameter is expected. When a parameter is surrounded by brackets `[ ]`, this indicates that the parameter is optional.
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