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)

File inodes

When you go to a grocery store, you will find that each product has a set of attributes like:

  • Product type: Chocolate
  • Product price: $2.50
  • Product supplier: Kit Kat
  • Amount left: 199

These attributes can be displayed on any product in the grocery store by scanning the product's barcode. And each barcode is unique, of course. Well, you can apply this analogy to Linux. Every file on Linux has a set of attributes like:

  • File type
  • File size
  • File owner
  • File permissions
  • Number of hard links
  • File timestamp

These attributes are stored in a data structure called the inode (index node), and each inode is identified by a number (inode number). So you can think of inode numbers like the barcodes in a grocery store. Every file in Linux has an inode number and every inode number points to a file data structure, that is, the inode. And here is a formal definition of an inode:

What is an Inode?

An inode is simply a file data structure that stores file information (attributes), and...