How does the wildcard pattern '*.pdf' match files?

The wildcard pattern *.pdf matches files based on the following criteria:

Breakdown of the Pattern:

• Asterisk (*): This wildcard represents zero or more characters. It can match any sequence of characters, including none.
• .pdf: This specifies that the file must end with the .pdf extension.

Matching Behavior:

The pattern *.pdf will match any file name that:

• Ends with .pdf
• Can have any characters (or none) before the .pdf extension.

Examples of Matches:

• document.pdf
• report.pdf
• file123.pdf
• myfile.pdf
• example.pdf

Non-Matches:

• file.doc (does not end with .pdf)
• image.png (does not end with .pdf)
• text (no extension)

Usage in Commands:

You can use this pattern in commands like ls, cp, or rm to operate on all PDF files in a directory:

ls *.pdf

This command lists all files in the current directory that have a .pdf extension.

If you have any further questions or need more details, feel free to ask!