Finish Ruby command BEFORE moving on to the next

[Jason Hsu, Rubyist]

THE EASY PART:
I have four Ruby commands in a Ruby script that need to be executed in the following order:
1.  long_command1
2.  long_command2
3.  long_command3
4.  long_command4

THE HARD PART:
How do I make sure that the Ruby script finishes one command before moving on to the next one?  long_command1 needs to be completed before long_command2 can begin, long_command2 needs to be completed before long_command3 can begin, and long_command3 needs to be completed before long_command4 can begin.

[Vivek Sampara]

Correct me if im not wrong as long as its running on a single thread, there should be no confusion in terms of sequence. 

Just run them in sequence and they should work fine. 

long_command1

long_command2

long_command3

long_command4

The only cache is if all the commands are running in a single process and has no external dependencies. 

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