Wildcards in Linux

Wildcards

Wildcards are a set of characters that allow us to create a pattern defining a set of files or directories.

There are some basic set of wildcards includes:-

* represents zero or more characters.
? represents a single character.
[ ] represents a range of characters.

* Wildcard character- we can use this wildcard to replace any number of characters in a file.
E.g. ls n*

This results in a list of files/Directories that begins with n alphabet.

? Wildcard character- using this wildcard we can represent a single character. If we write

E.g. ls x?????? 

This will result in a list of files/Directories that begins with letter x and have exactly six characters after x.  Such as xyz.txt

[ ] Wildcard character- using this wildcard we can represent a range of characters. If we write
E.g. ls [a-c]*

Now this will result in a list of files/Directories that begins with a to c alphabets. Such as abc.txt, alltextfiles.txt, cat, computer.txt etc.

UNIT-301

Network Operating System

1. Network Operating System (NOS)
2. History of Linux
3. Advantages of Linux
4. Shell
5. Kernel
6. How to create files
7. Basic Shell Commands
8. Wildcards in Linux
9. Paths in Linux
10. Piping and Re-direction
11. Shell Scripting
12. VI Editor
13. Safety in Linux