The DIR (directory) command causes the names of all files that satisfy the ambiguous filename afn to be listed at the console device. As a special case, the command
lists all files (the command DIR is equivalent to the command DIR *.*). The following are valid DIR commands:
DIR X.Y DIR X?Y.C?M DIR ??.Y
If no files on the selected disk satisfy the directory request, the message No user files appears at the console.