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http://www.unix.com – I'm planning to learn Unix/Linux as much as possible to be able to expert on Unix system. I have a few questions in regard to Unix system 1. How come they are so many different type of Linux, and do they follow same standard commands in the Unix system? I'm afraid of having so many choices selecting right type of system. 2. Do you know which Unix\Linux is better than other or has higher market demand in regard to getting a good job? 3. Do you operate Unix system by only using commands, how many commands are they? 4. What is the easiest way to learn Unix other than practice every day (HowTos)