This document provides instructions for basic Linux commands and tasks such as changing directories, viewing files, editing files, compressing/uncompressing files, shutting down/restarting, adding users, viewing IP addresses, and installing software. Key commands covered include pwd, cd, vi, wq, cp, history, gzip, gunzip, init, ifconfig, useradd, passwd, rpm, and mounting/unmounting CDROMs. Levels for booting into different system states like single user mode are also explained.