Introducing UNIX and Linux

Maintaining your Linux OS

Overview
Basic management
      Passwords
      Checking storage space
      Checking processes
      Managing users
      Shutting down and restarting your computer
      Automating tasks
Linux file management
      File compression and archiving tools
      File managers
      File splitters
Linux networking
      Getting started
      MAC and IP addresses
      Domain names
      Adding a Linux host to an existing network
      Building a private network
      Configuring the network interface
Security
Uninstalling Linux
Summary

Passwords

If the security of your system is of concern, then you will need to update your passwords regularly. This is best done through the passwd command which can be issued from a terminal window. It allows the current user (that is, the user who is currently logged in) to change their password. If you want to change the password of other users on the system, it can be done using the command

passwd user

Note, however, that in order to change the password of other users, you must be logged in as the root user.