Book Image

Learn Linux Quickly

By : Ahmed AlKabary
Book Image

Learn Linux Quickly

By: Ahmed AlKabary

Overview of this book

Linux is one of the most sought-after skills in the IT industry, with jobs involving Linux being increasingly in demand. Linux is by far the most popular operating system deployed in both public and private clouds; it is the processing power behind the majority of IoT and embedded devices. Do you use a mobile device that runs on Android? Even Android is a Linux distribution. This Linux book is a practical guide that lets you explore the power of the Linux command-line interface. Starting with the history of Linux, you'll quickly progress to the Linux filesystem hierarchy and learn a variety of basic Linux commands. You'll then understand how to make use of the extensive Linux documentation and help tools. The book shows you how to manage users and groups and takes you through the process of installing and managing software on Linux systems. As you advance, you'll discover how you can interact with Linux processes and troubleshoot network problems before learning the art of writing bash scripts and automating administrative tasks with Cron jobs. In addition to this, you'll get to create your own Linux commands and analyze various disk management techniques. By the end of this book, you'll have gained the Linux skills required to become an efficient Linux system administrator and be able to manage and work productively on Linux systems.
Table of Contents (24 chapters)

Creating hard links

The story is a little bit different when it comes to hard links. That's because a hard link is a replica of the original file. And here is a definition of a hard link:

WHAT IS A HARD LINK?

A hard link is simply an additional name for an existing file. It has the same inode of the original file, and hence, it's indistinguishable from the original file.

You can think of it as a nickname. When somebody calls you by your nickname, they are still referring to you.

A hard link has the following properties:

  • A hard link has (shares) the same inode of the original file.
  • A hard link remains intact if the original file gets deleted.
  • Any change in the hard link is reflected in the original file.
  • You can't create hard links to directories.

The following diagram helps you visualize hard links:

Figure 4: A hard link visualization

We use the same ln command to create hard links, but this time we omit the -s option:

ln original_file hard_link

So to create a hard...