dir > print.txt
The ">" symbol is telling to put the output of the command to whatever is next. In this case "print.txt". This is useful for writing any output to a file in a script or whatever.
Example: dir > %USERPROFILE%\Desktop\print.txt
This example will print the directory listing to print.txt on your desktop.
dir /b file names only
dir /s include all sub folders & files
Original source: http://www.computerhope.com/issues/ch000772.htm
Actually I really like that site, and spent some time taking their quiz. Entertaining.