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Bash Cookbook

Bash Cookbook

By : Brash, Ganesh Sanjiv Naik
1 (1)
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Bash Cookbook

Bash Cookbook

1 (1)
By: Brash, Ganesh Sanjiv Naik

Overview of this book

In Linux, one of the most commonly used and most powerful tools is the Bash shell. With its collection of engaging recipes, Bash Cookbook takes you through a series of exercises designed to teach you how to effectively use the Bash shell in order to create and execute your own scripts. The book starts by introducing you to the basics of using the Bash shell, also teaching you the fundamentals of generating any input from a command. With the help of a number of exercises, you will get to grips with the automation of daily tasks for sysadmins and power users. Once you have a hands-on understanding of the subject, you will move on to exploring more advanced projects that can solve real-world problems comprehensively on a Linux system. In addition to this, you will discover projects such as creating an application with a menu, beginning scripts on startup, parsing and displaying human-readable information, and executing remote commands with authentication using self-generated Secure Shell (SSH) keys. By the end of this book, you will have gained significant experience of solving real-world problems, from automating routine tasks to managing your systems and creating your own scripts.
Table of Contents (10 chapters)
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Echoing output to raw terminal devices


In this recipe, we are going to learn how we can echo the output from one terminal to another. To achieve this, we are going to use tty.

Getting ready

Besides having a terminal open, you need basic knowledge of tty.

 

How to do it...

tty means teletype.tty displays terminal-related information. Everything in Linux is a file. So, tty prints the filename of the terminal that is connected to standard input.

Now, open a terminal and run tty:

$ tty

After running this command, the current tty session will be displayed.

Open another terminal B and do the same; you will get that terminal’s tty session.

Now I have two tty sessions as:

  • Terminal A = /dev/pts/4
  • Terminal B = /dev/pts/7

In Terminal A, run the following command:

$ echo "Hello World" > /dev/pts/7

Now check Terminal B; Hello world will be displayed on the terminal. Again, run the following command to send another string to terminal B.

$ echo "Hello This is John" > /dev/pts/7

How it works...

The following will be...

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