Sams Teach Yourself Shell Programming in 24 Hours, Second Edition

Questions

1:	Classify each of the following as simple, complex, or compound commands: $ ls $ date ; uptime $ ls –l $ echo "hello world" If you haven't seen some of these commands before, try them out on your system. As you progress through the book, each will be formally introduced.
2:	What is the effect of putting a semicolon at the end of a single simple or complex command? For example, will the output of the following commands be different? $ who am i $ who am i ;
3:	What are the two major types of shells? Give an example of a shell that falls into each type.