Changes

In a previous lesson, you learned that �filename filename expansion symbols allow �the the Linux shell to expand filenames as �arguments arguments (referred to as “globbing”) for file management commands.�This This is very useful for managing multiple files sharing similar characteristics such as the same file extension. Used for Linux commands such as�lsas ls, rm, mv, cp, cat, less and more.

Regular expressions are used to search, edit and manipulate text. This can represent text contained in files or text as a result of issuing Linux commands using a pipeline.��

A regular expression is a combination of two types of characters: literals and special characters. �In In combination, these characters define a logical pattern. Strings of text can be compared to this pattern to see if they fit the pattern defined by the expression.��