> For the complete documentation index, see [llms.txt](https://eric-lo.gitbook.io/lab5-pipe-signals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eric-lo.gitbook.io/lab5-pipe-signals/master.md).

# Introduction

Signals are a kind of interrupt to the running process. This tutorial contains some hand-on codes for you to try.

Pipe is a communication mechanism for sending information between processes. In this tutorial, you will learn more about pipe in Linux.

**You need to do:**

* Follow the left content step by step to learn how to use pipe.
* Answer the six questions (Q1-Q6) in Section 1 "Knowing about pipe", the answers can all be found in Section 2 and 3 (A1-A6)
* There are four programs in this tutorial, compile them, run them, understand them.

**After that, you should know:**

* What pipe really is.
* How pipe works.
* How to use pipe.

At the last section, some useful functions for the shell are included for your reference.

Prepared by Lu TANG and Calvin Kam, modified by Yiyao MA.