Docs: Refresh docs to organize and standardize reference materials. (#18403)

docs/cli/tutorials/file-management.md

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+# File management with Gemini CLI
+
+Explore, analyze, and modify your codebase using Gemini CLI. In this guide,
+you'll learn how to provide Gemini CLI with files and directories, modify and
+create files, and control what Gemini CLI can see.
+
+## Prerequisites
+
+- Gemini CLI installed and authenticated.
+- A project directory to work with (e.g., a git repository).
+
+## How to give the agent context (Reading files)
+
+Gemini CLI will generally try to read relevant files, sometimes prompting you
+for access (depending on your settings). To ensure that Gemini CLI uses a file,
+you can also include it directly.
+
+### Direct file inclusion (`@`)
+
+If you know the path to the file you want to work on, use the `@` symbol. This
+forces the CLI to read the file immediately and inject its content into your
+prompt.
+
+```bash
+`@src/components/UserProfile.tsx Explain how this component handles user data.`
+```
+
+### Working with multiple files
+
+Complex features often span multiple files. You can chain `@` references to give
+the agent a complete picture of the dependencies.
+
+```bash
+`@src/components/UserProfile.tsx @src/types/User.ts Refactor the component to use the updated User interface.`
+```
+
+### Including entire directories
+
+For broad questions or refactoring, you can include an entire directory. Be
+careful with large folders, as this consumes more tokens.
+
+```bash
+`@src/utils/ Check these utility functions for any deprecated API usage.`
+```
+
+## How to find files (Exploration)
+
+If you _don't_ know the exact file path, you can ask Gemini CLI to find it for
+you. This is useful when navigating a new codebase or looking for specific
+logic.
+
+### Scenario: Find a component definition
+
+You know there's a `UserProfile` component, but you don't know where it lives.
+
+```none
+`Find the file that defines the UserProfile component.`
+```
+
+Gemini uses the `glob` or `list_directory` tools to search your project
+structure. It will return the specific path (e.g.,
+`src/components/UserProfile.tsx`), which you can then use with `@` in your next
+turn.
+
+> **Tip:** You can also ask for lists of files, like "Show me all the TypeScript
+> configuration files in the root directory."
+
+## How to modify code
+
+Once Gemini CLI has context, you can direct it to make specific edits. The agent
+is capable of complex refactoring, not just simple text replacement.
+
+```none
+`Update @src/components/UserProfile.tsx to show a loading spinner if the user data is null.`
+```
+
+Gemini CLI uses the `replace` tool to propose a targeted code change.
+
+### Creating new files
+
+You can also ask the agent to create entirely new files or folder structures.
+
+```none
+`Create a new file @src/components/LoadingSpinner.tsx with a simple Tailwind CSS spinner.`
+```
+
+Gemini CLI uses the `write_file` tool to generate the new file from scratch.
+
+## Review and confirm changes
+
+Gemini CLI prioritizes safety. Before any file is modified, it presents a
+unified diff of the proposed changes.
+
+```diff
+- if (!user) return null;
++ if (!user) return <LoadingSpinner />;
+```
+
+- **Red lines (-):** Code that will be removed.
+- **Green lines (+):** Code that will be added.
+
+Press **y** to confirm and apply the change to your local file system. If the
+diff doesn't look right, press **n** to cancel and refine your prompt.
+
+## Verify the result
+
+After the edit is complete, verify the fix. You can simply read the file again
+or, better yet, run your project's tests.
+
+```none
+`Run the tests for the UserProfile component.`
+```
+
+Gemini CLI uses the `run_shell_command` tool to execute your test runner (e.g.,
+`npm test` or `jest`). This ensures the changes didn't break existing
+functionality.
+
+## Advanced: Controlling what Gemini sees
+
+By default, Gemini CLI respects your `.gitignore` file. It won't read or search
+through `node_modules`, build artifacts, or other ignored paths.
+
+If you have sensitive files (like `.env`) or large assets that you want to keep
+hidden from the AI _without_ ignoring them in Git, you can create a
+`.geminiignore` file in your project root.
+
+**Example `.geminiignore`:**
+
+```text
+.env
+local-db-dump.sql
+private-notes.md
+```
+
+## Next steps
+
+- Learn how to [Manage context and memory](memory-management.md) to keep your
+  agent smarter over long sessions.
+- See [Execute shell commands](shell-commands.md) for more on running tests and
+  builds.
+- Explore the technical [File system reference](../../tools/file-system.md) for
+  advanced tool parameters.