Overview of System Administration
A System Administrator's Responsibilities
A Brief History of UNIX
Linux
Linux Distributions
Navigating the Documentation

User Administration
What is a "user" in Linux?
The /etc/passwd File
Groups
The /etc/group File
Passwords
The /etc/shadow File
Adding Users
Deleting Users
Modifying User Attributes
The Login Process
/etc/profile and .profile
Communicating With Users: /etc/issue
Communicating With Users: The Wall Command

File System Basics
The Hierarchy
Files
Directories
Special Files
Character and Block Devices
The/dev Directory
Links
Symbolic Links
A File System Tour
The df Command
The du Command
The find Command

Advanced File System Concepts
The Virtual File System
The Physical File System
The Inode Table
File Storage in Disk Blocks
The Superblock
Linux File Attributes

Disk Management
Partitions and File Systems
Making a File System
The mkfs Command
The mount Command
Sharing File Systems
The fstab File
The fsck Command
The lost+found Directory
The fdisk Command

Backups
Backup Strategies
Backup Tools
The tar Command
The cpio Command
The dump Command
Network Backup Strategies

Linux Processes
Overview of Processes
Process Space
Process Table
The fork/exec Mechanism
The ps Command
The /proc File System
Background Processes
The kill Command
Scheduling Jobs
The cron Daemon
The at Command
The crontab Command
Format of cron Files
Access to Scheduling Facilities

 System Startup and Shutdown
Overview of the Bootup Sequence
LILO
The lilo.conf File
The init Daemon
/etc/inittab
The init Command
The rc Scripts
Single-User Mode
The shutdown Command

Linux System Security
Security Overview
Physical Security
Account Security
SUID and SGID Settings
File and Directory Permissions
Software Security
Securing a Network Server
Firewalls

Performance Monitoring and Tuning
Performance Issues
Methods of Improving Performance
Swapping and Paging
Managing Swap Space
The top Command
The vmstat Command
The strace Command

Networking Utilities
Basic Network Needs
IP Addresses
The /etc/hosts File
DNS
The nslookup Command
Subnets
Telnet
FTP
Ping

Configuring TCP/IP
Network Interfaces
The ifconfig Command
TCP/IP and Ports
The /etc/services File
The inetd Daemon
The /etc/inetd.conf File
Network Startup
The netstat Command
The route Command
The traceroute Command

The Print System
Printing Overview
Adding a Printer
The lpd Daemon
The /etc/printcap File
The lpr, lpq, and lprm Commands
The lpc Command
Network Printers
Interfaces and Filters

Package Management
Software Installation and Management
The rpm Command
Installing and Upgrading Software With rpm
Removing Packages
The rpm Database
Building Software From Source

Server Configuration and Management
Standard Network Services
File and Print Sharing
Samba
The Apache Web Server
Managing FTP
Internet Mail Service
Managing a DNS Server

Overview of NIS
What is NIS?
Why Use NIS?
NIS Design and Implementation
NIS Maps
Configuring NIS