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
8.9 Exercise
What is difference between Shell Variable and Environment Variable?
What is difference between 'while' sentence and 'until' sentence?
What is difference between “if [ $val == '20' ]” and “if [ $val -eq 20 ]”