This document provides a tutorial on common Linux commands. It lists commands like ls to list files, file to check file types, mkdir to make directories, cd to change directories, cp to copy, mv to move, and rm to remove files and directories. It also covers commands like cat to view file contents, grep to search files, more and less to page through large files, chown to change ownership, chmod to change permissions, ps to view processes, and kill and killall to terminate processes. The document explains that running "man [command]" provides documentation for each command.