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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
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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

Wildcard characters

The wildcard characters are special characters in Linux, and they are used to specify a group (class) of characters. Table 13 lists all the Linux wildcards:

Wildcard What it does
* Matches any character(s).
? Matches any single character.
[characters] Matches the characters that are members of the set characters. For example, [abc] will match the characters a, b, or c.
[!characters] Matches any character that is not a member of the set characters. It is basically the negation of [characters]. For example, [!abc] will match any character that is not a, b, or c.
[[:class:]] Matches any character that is a member of the character class.
Table 13: Linux wildcards

You have already seen character classes before when we were discussing the tr command. Remember [:lower:] and [:upper:] represent lower and upper case letters, these are two examples of character classes. Table 14 lists the most common character classes:

...
Character Class What it represents
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