Wildcards, also know as globbing, provide a way to select a subset of files based on patterns of characters.

This is especially useful if you work with many files.

Summary:
* - any number of any character.
? - any single character
[characters] - any character that is in the list [characters]
! - reverses the condition
[[:class:]] - any character that is a memnber of the class [:class:]

Most commonly used classes:

[:alpha:] alphabetic
[:alnum:] alphanumeric
[:upper:] uppercase
[:lower:] lowercase
[:digit:] numbers, 0 to 9
[:space:] whitespace (spaces, tabs, newlines)
[:graph:] printable characters excluding space
[:print:] printable characters including space
[:punct:] punctuation characters

This episode shows the difference between hard and soft/symbolic links and how to use them.

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