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Learn Linux Quickly

You're reading from   Learn Linux Quickly A beginner-friendly guide to getting up and running with the world's most powerful operating system

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Product type Paperback
Published in Aug 2020
Publisher Packt
ISBN-13 9781800566002
Length 338 pages
Edition 1st Edition
Tools
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Author (1):
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Ahmed AlKabary Ahmed AlKabary
Author Profile Icon Ahmed AlKabary
Ahmed AlKabary
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Toc

Table of Contents (24) Chapters Close

Preface 1. Your First Keystrokes 2. Climbing the Tree FREE CHAPTER 3. Meet the Editors 4. Copying, Moving, and Deleting Files 5. Read Your Manuals! 6. Hard versus Soft Links 7. Who Is Root? 8. Controlling the Population 9. Piping and I/O Redirection 10. Analyzing and Manipulating Files 11. Let's Play Find and Seek 12. You Got a Package 13. Kill the Process 14. The Power of Sudo 15. What's Wrong with the Network? 16. Bash Scripting Is Fun 17. You Need a Cron Job 18. Archiving and Compressing Files 19. Create Your Own Commands 20. Everyone Needs Disk Space 21. echo "Goodbye My Friend" 22. Assessments 23. Other Books You May Enjoy

Reading user input

Let's create a better version of our hello.sh script. We will let the user input his/her name and then we will greet the user; create a script named greet.sh with the following lines:

elliot@ubuntu-linux:~$ cat greet.sh 
#!/bin/bash

echo "Please enter your name:"
read name

echo "Hello $name!"

Now make the script executable and then run it:

elliot@ubuntu-linux:~$ chmod a+x greet.sh 
elliot@ubuntu-linux:~$ ./greet.sh
Please enter your name:

When you run the script, it will prompt you to enter your name; I entered Elliot as my name:

elliot@ubuntu-linux:~$ ./greet.sh 
Please enter your name:
Elliot
Hello Elliot!

The script greeted me with "Hello Elliot!". We used the read command to get the user input, and notice in the echo statement, we used a dollar sign, $, to print the value of the variable name.

Let's create another script that reads a filename from the user and then outputs the size of the file in bytes; we will name our script size...

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