From MorphOS Library
DIR - Lists file and directory names (w/o attributes)
DIR, OPT/K, ALL/S, DIRS/S, FILES/S, INTER/S
DIR - directory to list OPT - provided for compatibility: deprecated ! ALL - displays all subdirectories and their files. DIRS - only displays directories FILES - only displays files INTER - enters an interactive listing mode (see below).
Interactive listing mode stops after each name to display a question mark at which you can enter commands. The acceptable responses are shown below:
[Return] - Displays the next name on the list. [E] - Enters a directory; the files in that directory are displayed. [B] - Goes back one directory level. [DEL] - Deletes a file or empty directory. DEL does not refer to the Del key; enter the letters D, E, and L. [T] - Types the contents of a file. [C] - Allows you to enter additional AmigaDOS commands. [COMMAND]- Idem. [Q] - Quits interactive editing. [?] - Displays a list of the available interactive-mode commands.