This document provides an overview of system administration topics including user administration, file system basics, advanced file system concepts, and disk management. It discusses user and group management using files like /etc/passwd and /etc/group. It also outlines the hierarchy and components of the file system, how files and directories are organized, and commands to view and manage disk usage and the file system like df, du, find, mkfs, mount, and fsck.

3.  Overview of System Administration
• System Administrator Responsibilities
• A Brief History of UNIX
• Evolving Standards
• Navigating the Documentation
User Administration
• What is a “user” in UNIX?

4.  • The /etc/passwd File
• Groups
• The /etc/group File
• Passwords
• Adding Users
• Deleting Users
• Modifying User Attributes
• The Login Process
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5.  • /etc/profile and .profile
• Communicating with Users: /etc/motd
• Communicating with Users: The wall Command
File System Basics
• The Hierarchy
• Files
• Directories
• Device Files

6.  • Character and Block Devices
• The/dev Directory
• Links
• Symbolic Links
• A File System Tour
• The df Command
• The du Command
 • The find Command

7.  Advanced File System Concepts
• The Physical File System
• The Inode File
• File Storage in Disk Blocks
• The Superblock
• The Free List
• Slices and File Systems
• File System Types
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8.  Disk Management
• Making a File System
• The mkfs Command
• Sharing Filesystems
• The mount Command
• The fstab File
• The fsck Command
• The lost+found Directory
• The prtvtoc Command

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