Learn advanced concepts of Bash shell programming.

Bash Programming

After going through the basics of Bash programming in the previous module, we’ll now learn some important key concepts of Bash, such as tests, exit codes, job controls, traps, subshell, and more. In this module, the interactive nature of the module instills the knowledge in a way we will not forget!

Master the Bash Shell

### How Important is this Lesson?

Job control is a core feature of bash, and considered a central concept to
understand if you are using bash every day.

### Starting Jobs

You're going to look at running a simple job using the `sleep` command.

Type this in:



You typed a 'normal' command (`sleep 60`) and then added in another character,
the ampersand (`&`). The ampersand will run the command 'in the background', which
becomes a *job* in this bash session.

The *job* has two identifiers, which are immediately reported to you in the terminal.

```html
[1] 39165
```

The first is the *job number*, which in this case is `1`, and the second is the
*process identifier*, in this case `39165`, but this will be different for you.

If, before the time is up, you run any other commands:

then they are not interfered with by this running job. You can just carry on as normal.

If you wait for the program to finish (60 seconds in this case), and then run any other
command, then bash will report to you what happened to that job. For example, if you wait, and type:

# How Important is this Lesson?

Job control is a core feature of bash, and considered a central concept to
understand if you are using bash every day.

# Starting Jobs

You're going to look at running a simple job using the `sleep` command.

Type this in:



In this lesson, you’ll learn what job control is, and how to manage and run multiple jobs in your shell.

Before We Begin

Core Bash

Scripting Bash

Bash in Practice

Advanced Bash

Conclusion

Job Control

How Important is this Lesson?

Starting Jobs