Introducing UNIX and Linux

Getting started

Overview
Using UNIX
      Usernames
      Logging in
Logging out
Commands
      Typing in commands
      Commands and options
Communication with other users
      Email
      Other communication facilities
Files
      The editor Vi
            Vi commands (command mode)
            Vi commands (colon mode)
      Other editors
Input and output
      Scripts
      Here-documents
      Pipes
      Making copies of input and output
      Pagers
Emergencies
Getting help
Summary
Exercises

Communication with other users

A big advantage of modern computer networks is that messages may be sent between users of machines on such a network, or people on the same machine, and email has become ubiquitous. It is also possible to send messages to other users, either on the same machine, or elsewhere on a network, 'real-time'.