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)

Counting characters, words, and lines

The word count wc command is yet another very handy command. It counts the number of lines, words, and characters in a file. For example, to display the number of lines in the file facts.txt, you can use the -l option:

elliot@ubuntu-linux:~$ wc -l facts.txt
12 facts.txt

There are a total of 12 lines in the file facts.txt. To display the number of words, you can use the -w option:

elliot@ubuntu-linux:~$ wc -w facts.txt
37 facts.txt

So there is a total of 37 words in the file facts.txt. To display the number of characters (bytes), you can use the -c option:

elliot@ubuntu-linux:~$ wc -c facts.txt
210 facts.txt

There is a total of 210 characters in the file facts.txt. Without any options, the wc command will display the number of lines, words, and characters side by side:

elliot@ubuntu-linux:~$ wc facts.txt
12 37 210 facts.txt