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)

Redirecting standard output

You know that running the date command will display the current date on your terminal:

elliot@ubuntu-linux:~$ date 
Sat May 11 06:02:44 CST 2019

Now by using the greater than sign >, you can redirect the output of the date command to a file instead of your terminal! Have a look:

elliot@ubuntu-linux:~$ date > mydate.txt

As you can see, there is no output displayed on your screen! That's because the output got redirected to the file mydate.txt:

elliot@ubuntu-linux:~$ cat mydate.txt 
Sat May 11 06:04:49 CST 2019

Cool! Let's try some more examples. You can print a line on your terminal with the echo command:

elliot@ubuntu-linux:~$ echo "Mars is a planet." 
Mars is a planet.

If you want to redirect the output to a file named planets.txt, you can run the command:

elliot@ubuntu-linux:~$ echo "Mars is a planet." > planets.txt 
elliot@ubuntu-linux:~$ cat planets.txt
Mars is a planet

Awesome! Notice that the file planets.txt was also...