npm package: @stdlib/fs-append-file-cli
Description: Append data to a file.
Author: The Stdlib Authors
Latest version: 0.0.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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</details>

# Append File

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Append data to a file.











<section class="cli">



<section class="installation">

## Installation

To use as a general utility, install the CLI package globally

```bash
npm install -g @stdlib/fs-append-file-cli
```

</section>

<!-- CLI usage documentation. -->

<section class="usage">

## Usage

```text
Usage: append-file [options] <filepath>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
  --enc, --encoding encoding   Encoding. Default: 'utf8'.
         --flag flag           Flag. Default: 'a'.
         --mode mode           Mode. Default: 0o666.
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   Relative output file paths are resolved relative to the current working directory.
-   Errors are written to `stderr`.
-   File contents should be provided over `stdin` as part of a [standard stream][standard-stream] pipeline.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

```bash
$ printf 'beep boop\n' | append-file ./examples/fixtures/file.txt
```

</section>

<!-- /.examples -->

</section>

<!-- /.cli -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

## See Also

-   <span class="package-name">[`@stdlib/fs-append-file`][@stdlib/fs-append-file]</span><span class="delimiter">: </span><span class="description">append data to a file.</span>


</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

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[npm-image]: http://img.shields.io/npm/v/@stdlib/fs-append-file-cli.svg
[npm-url]: https://npmjs.org/package/@stdlib/fs-append-file-cli

[test-image]: https://github.com/stdlib-js/fs-append-file/actions/workflows/test.yml/badge.svg?branch=v0.0.3
[test-url]: https://github.com/stdlib-js/fs-append-file/actions/workflows/test.yml?query=branch:v0.0.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/fs-append-file/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/fs-append-file?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

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[cli-section]: https://github.com/stdlib-js/fs-append-file#cli
[cli-url]: https://github.com/stdlib-js/fs-append-file/tree/cli
[@stdlib/fs-append-file]: https://www.npmjs.com/package/@stdlib/fs-append-file

[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/fs-append-file/tree/deno
[deno-readme]: https://github.com/stdlib-js/fs-append-file/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/fs-append-file/tree/umd
[umd-readme]: https://github.com/stdlib-js/fs-append-file/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/fs-append-file/tree/esm
[esm-readme]: https://github.com/stdlib-js/fs-append-file/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/fs-append-file/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/fs-append-file/main/LICENSE

[node-fs]: https://nodejs.org/api/fs.html

[@stdlib/buffer/ctor]: https://www.npmjs.com/package/@stdlib/buffer-ctor

[standard-stream]: https://en.wikipedia.org/wiki/Pipeline_%28Unix%29

</section>

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