a contextual clue

ONE CONTEXTUAL CLUE THAT I FOUND FROM READING THE BOOK "INTRODUCTION TO OPERATING SYSTEMS" THE WORD IS DIR COMMAND. AFTER READING A PARAGRAPH I REALIZED THAT A DIR COMMAND IS TELLS THE FILE SUBSYSTEM OF THE KERNEL TO FIND OUT WHAT FILES ARE AVAILABLE. DIFERENT WORDS SUCH AS FILES, DEVICE AND INFORMATION HELPED ME FIGURE OUT WHAT A DIR COMMAND IS.