CMD

Where

<Command Options>
/R: Recursively searches and displays the files that match the given pattern starting from the specified directory.

<Examples of Usage>
where /r . *.pdf
# search files recursively

Dir

<Command Options>
/B: Uses bare format (no heading information or summary).
/S: Displays files in specified directory and all subdirectories.

<Examples of Usage>
dir /b /s "directoryname"
# search directories recursively

Findstr

<Examples of Usage>
findstr /s /d:c:\windows /m mp3 *
# Look in C:\windows and its subdirectories for all files that contain the string "mp3"