This document is a student assignment submitted by Muhammad Jamil to Sir Rehan. It discusses the command line interface in 3 paragraphs. It first discusses how the command line interface is similar to the DOS interface and provides interaction through commands. The second paragraph explains how to use the "cd" or change directory command to change drives on a hard disk. The third paragraph defines the "dir" command and explains that it allows users to see all folders and subfolders in a directory.