# Piping

## Piping

{% hint style="info" %}
For complete API documentation refer to: [pub.dev](https://pub.dev/documentation/dcli/latest/dcli/dcli-library.html)
{% endhint %}

Now let's pipe the output of one cli command to another.

```dart
('grep import *.dart' | 'head -n 5').forEach((line) => print(line)) ;
```

The above command launches 'grep' and 'head' to find all import lines in any Dart file and then trim the list (via head) to the first five lines and finally print those lines.

Note: when you use pipe you MUST surround the pipe commands with parentheses () due to a precedence issue. In the above example note the parentheses just before the .forEach and the matching one at the start of the line.

What we have now is the power of Bash and the elegance of Dart.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dcli.onepub.dev/dcli-api/piping.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.