FileNames

FileNames[] lists all files in the current working directory.

FileNames[form] lists files matching a string pattern.

FileNames[forms, dirs, n] includes files in subdirectories up to n levels deep.

Examples

List all files:

FileNames[]
(* {"file1.txt", "file2.m", ...} *)

Find specific files:

FileNames["*.txt"]
(* {"data.txt", "notes.txt"} *)

Recursive search:

FileNames["*.m", {Directory[]}, Infinity]

Please visit the official Wolfram Language Reference for more details.