About this book
1. What is Linux?
2. Basic Command (1)
3. Regular expression and Pipe
4. Basic Command (2)
5. Text editor
6. Administrator's work
7. User authority and Access right
8. Shell Script
9. Network setup and management
10.File Management
4.8 The chapter test
Explain the meaning of -n option of sort command and the case when it is used.
Explain how to get output removed duplicate lines completely using uniq command.
