> ## Documentation Index
> Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Perform Basic File Management Part 2 cpio

> This lesson covers the `cpio` utility for creating and extracting archives in UNIX, highlighting its usage and command options.

In this lesson, we’ll dive into the `cpio` utility, a classic UNIX tool for creating and extracting archives. Whether you’re bundling application files or unpacking backup archives, `cpio` offers a straightforward, scriptable interface.

## What Is `cpio`?

CPIO stands for **Copy In, Copy Out**. Unlike `tar`, which handles device archives too, `cpio` reads and writes archives strictly via **standard input** and **standard output**. You typically pipe a file list into `cpio` to create an archive, or feed an archive into `cpio` to extract its contents.

### Common Use Cases

| Task                          | cpio Option | Description                                      |
| ----------------------------- | ----------- | ------------------------------------------------ |
| Create an archive             | `-o`        | Copy out files into a new archive                |
| Extract files from an archive | `-i`        | Copy in files from an existing archive           |
| Create directories as needed  | `-d`        | Automatically make parent directories on extract |

## How `cpio` Works

1. **Generate a file list** (e.g., via `find` or `ls`).
2. **Pipe** that list to `cpio`.
3. **Specify mode**:
   * `-o` for output (create archive)
   * `-i` for input (extract archive)

<Callout icon="lightbulb" color="#1CB2FE">
  `cpio` does not infer the archive format from file extensions. You control its behavior exclusively with command-line options.
</Callout>

***

## 1. Creating an Archive

To package all files in the current directory into `archive.cpio`:

```bash theme={null}
ls | cpio -o > archive.cpio
```

Explanation:

* `ls` lists filenames (one per line).
* The pipe (`|`) directs that list into `cpio`.
* `cpio -o` writes an archive to **stdout**.
* `> archive.cpio` redirects stdout into your archive file.

You can also use `find` to include subdirectories:

```bash theme={null}
find . -depth | cpio -o > project.cpio
```

## 2. Extracting an Archive

Unpack the contents of `archive.cpio`, creating directories as needed:

```bash theme={null}
cpio -id < archive.cpio
```

Breakdown:

* `cpio -i` reads an archive from **stdin**.
* `-d` ensures that all required directories are created.
* `< archive.cpio` feeds the archive into `cpio`.

<Callout icon="triangle-alert" color="#FF6B6B">
  By default, `cpio` preserves file ownership and permissions. Run as root only if you trust the archive contents to avoid overwriting critical system files.
</Callout>

***

## Quick Reference: `cpio` Options

| Option   | Description                                  |
| -------- | -------------------------------------------- |
| `-o`     | Create an archive (Copy Out)                 |
| `-i`     | Extract from an archive (Copy In)            |
| `-d`     | Create directories as needed when extracting |
| `-v`     | Verbose mode (list files processed)          |
| `-H fmt` | Select archive format (e.g., `newc`, `odc`)  |

***

## Links and References

* [cpio(1) Manual Page](https://man7.org/linux/man-pages/man1/cpio.1.html)
* [GNU `cpio` Documentation](https://www.gnu.org/software/findutils/manual/html_node/cpio-invocation.html)
* [Linux Archive Management Overview](https://linux.die.net/man/1/cpio)

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